Crash Course Ecology Worksheets
Crash Course Ecology WorksheetsEcological Succession (Crash Course!) Flashcards | Quizlet Ecological Succession (Crash Course!) 5. review game; Monday - go over study guide (will be checked for completion and accuracy in class). Crash Course Ecology Worksheets - total of 8 printable worksheets available for this concept. The Digestive System: Crash Course Biology #128 Circulatory & Respiratory Systems: Crash Course Biology #127 The Nervous System: Crash Course Biology #26 Animal. Population ecology , community ecology , and ecosystem ecology.
Crash Course Worksheets Ecology Teaching Resources.
Displaying all worksheets related to - Crash Course Ecology.
Crash Course: Biology and Ecology.
Worksheets are Crash course answer key, The ups and downs of populations, Handout draft, Natural selection. What is the Competitive Exclusion Principle a. Ecology – Rules for Living on Earth: Crash Course Biology #140 Fungi – Death Becomes Them: Crash Course Biology #139 The Plants & The Bees – Plant Reproduction: Crash Course Biology #138 Vascular Plants = Winning!: Crash Course Biology #137 The Reproductive Lives of Nonvascular Plants – Alternation of Generations: Crash Course Biology #136. Showing top 8 worksheets in the category - Crash Course Ecology. “Human Population Growth - Crash Course Ecology #3”: 1. CrashCourse40 Ecology worksheet. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere. Click the card to flip 👆 1 / 31 Flashcards Learn Test Match Created by mccauley3606 Terms in this set (31) General: Population Ecology.
Natural Selection (video).
com/Browse/Search:crash course worksheets ecology Ecosystem Ecology Worksheet Answers. Home > Earth Science > Unit 13 - Ecology > Worksheets - Ecology. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection Created by Danis Marandis This ZIP file contains Microsoft Word document worksheets (along. video Crash Course Ecology - key terms limiting factors, carrying capacity, trophic levels, bioaccumulation; Thurs Sept 17. Whenever species compete, they’re going after the _resources_ that they need for their survival and continuedpopulation growth. This is a worksheet to accompany the crash course video for Ecology #7: Ecosystem Ecology. Here, you can browse videos, articles, and exercises by topic.
Results for ecology crash course worksheets and answers.
A collection of living and nonliving things interacting in a specific place is. Explore the amazing collection here, with new resources and courses added constantly to broaden the reaches of the Crash Course experience. Part 1: Ecological Succession Read the below passages and answer the corresponding questions Ecosystems Changing Ecosystems constantly change. 0 (2 reviews) Primary Succession Click the card to flip 👆 What type of succession is it when life appears where there previously was none? Click the card to flip 👆 1 / 6 Flashcards Learn Test Match Created by thirtycats Terms in this set (6). The videos, appropriate for in class or remote learning, use the 9th edition of Reece's Campbell Biology as the base text. Sadly, he died of renal caner at the age of 42, but his study of northern warblers remains a classic example of community. By purchasing this file, you agree not to make it publicly available (on websites, etc.
Ecosystem Ecology: Links in the Chain.
“Human Population Growth - Crash Course Ecology #3”: 1. A tree falling in a forest affects the forest ecosystem. Learn Why carbon is everywhere Water - Liquid awesome Biological molecules - You are what you eat. Ecology Conservation and Restoration Ecology: Crash Course Ecology #12 Pollution: Crash Course Ecology #11 5 Human Impacts on the Environment: Crash Course Ecology #10 Nitrogen & Phosphorus Cycles - Always Recycle! Part 2: Crash Course Ecology #9 The Hydrologic and Carbon Cycles - Always Recycle!: Crash Course Ecology #8. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection. Fill in the gaps in the ecological | Course Hero Red Rocks Community College BIO BIO 112 CrashCourse40 Ecology worksheet. pdf 1 Crash Course Ecology 4 Community Ecology-1 copy. Name: _____ Date: _____ Period: _____ “Ecosystem Ecology: Links in the Chain - Crash Course Ecology #7”: 1. The human population has been undergoing massive exponential growth since _________________.
Crash Course Biology 40 Teaching Resources.
Population Ecology: Crash Course Ecology #2 Quiz.
answer choices ecosystem ecology community ecology population ecology photography ecology Question 4 900 seconds Q. docx 1 The Texas Mosquito Mystery. chemosynthesis video clip; work on study. intro to Ecology guide food chains and webs guide. Atoms - Organisms acquire the atoms they need from the ecosystem they live in. Crash Course-Ecology 3. Answer key is included as well.
Khan Academy">Natural Selection (video).
Crash Course Ecosystem Ecology Worksheet Answers.
Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a. We keep the library up-to-date, so you may find new or improved content over time. Crash Course: Biology Hank Green teaches you biology! Learn, study and understand the science of life. This selection of 12 worksheets covers the field of ecology, including the history of Earth, ecosystems, biodiversity, population ecology, community ecology, predators, human. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. chemosynthesis video clip; work on study guide; review nutrient cycles, study Intro to Ecology quizlet for vocab Fri Sept 18. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection Created by Danis Marandis This ZIP file contains Microsoft Word document worksheets (along with PDF versions) for each of the twelve episodes of Crash Course Ecology hosted by Hank Green. Since 2011, brothers John and Hank Green have pioneered digital education with their series Crash Course on YouTube. fecundity-dependent; density-independent. video Crash Course Ecology - key terms limiting factors, carrying capacity, trophic levels, bioaccumulation; Thurs Sept 17. Molecules - Chemical structure consisting of two or more units called atoms. CrashCourse40 Ecology worksheet.
Crash Course: Hydrologic and Carbonic Cycles.
The study of how all living and non-living things interact within an entire ecosystem. crashcourse Community Ecology: Feel the Love - Crash Course Ecology #4 Info Description Transcript Expand all | Collapse all Introduction ( 0:00) I wouldn't be much of a teacher if I didn't tell you that life is tough and that everyone's looking out for themselves in this world. Erica Brozovsky (from PBS's Otherwords) hosts and breaks down how to apply for, succeed. Worksheets are Crash course answer key, The ups and down.
Crash Course Ecology 7 Food Chains.
density-dependent; density-independent. 4 (5 reviews) General: Population Ecology Click the card to flip 👆 Most Zoomed in: look at groups within a species and see how they live together in one.
Crash Course Biology">Crash Course Biology.
4 (5 reviews) General: Population Ecology Click the card to flip 👆 Most Zoomed in: look at groups within a species and see how they live together in one geographic area. Browse crash course worksheets science ecology resources on Teachers Pay Teachers, a marketplace trusted by millions of teachers for original educational resources. Ecology (from Greek: οἶκος, "house", or "environment"; -λογία, "study of" ) is the scientific analysis and study of interactions among organisms and their environment. From Science to Social Studies, Crash Course offers it all in quick-paced, imaginative. Viewers take a Crash Course in Ecology with a 12-video collection that takes a look at where organisms come from, how they interact, and how they influence their environments. Carbon cycle game Resources for this unit Intro to Ecology vocab quizlet Intro to Ecology presentations Intro to Ecology ppt food chains and webs ppt 10% rule the carbon cycle Note guides for Intro to Ecology the Intro to Ecology and the Symbiosis ppt did NOT have a note guide associated with them.
Ecological Succession: Change is Good.
This three page video worksheet contains 20 short answer. Unit 1: Intro to biology Welcome to biology! The science of biology Water and life Unit 2: Chemistry of life Elements and atoms Electron shells and orbitals Chemical bonds and reactions Unit 3: Water, acids, and bases Hydrogen bonding in water Cohesion and adhesion Temperature and state changes in water Acids, bases, and pH. Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of. Crash Course: Ecology © 2023 Khan Academy Terms of use Privacy Policy Cookie Notice The hydrologic and carbon cycles: Always recycle! Google Classroom About Transcript Hank explains how carbon and water are recycled through ecosystems and the biosphere.
Crash Course Ecology #4 (Community Ecology) ….
The Crash Course team has produced more than 45 courses on a wide variety of subjects, including organic chemistry, literature, world history, biology, philosophy, theater, ecology, and many more!.
Ecology Crash Course Worksheets And Answers Teaching.
Fill in the gaps in the ecological. Ecology Conservation and Restoration Ecology: Crash Course Ecology #12 Pollution: Crash Course Ecology #11 5 Human Impacts on the Environment: Crash Course. This selection of 12 worksheets covers the field of ecology, including the history of Earth, ecosystems, biodiversity, population ecology, community ecology, predators, human impacts, pollution, ecological succession, biogeochemical cycles, and conservation and restoratio Subjects: Biology, Earth Sciences, Science Grades: 8 th - 10 th Types:. Crash Course Ecology Ecology Conservation and Restoration Ecology: Crash Course Ecology #12 Pollution: Crash Course Ecology #11 5 Human Impacts on the Environment: Crash Course Ecology #10 Nitrogen & Phosphorus Cycles – Always Recycle! Part 2: Crash Course Ecology #9 The Hydrologic and Carbon Cycles – Always Recycle!: Crash Course Ecology #8. 156 Resources Sort By Lesson Crash Course: Computer Science Videos Grades 3-8 Read More Lesson Romeo and Juliet: Crash Course Videos Grades 9-12 Read More Lesson. The Digestive System: Crash Course Biology #128 Circulatory & Respiratory Systems: Crash Course Biology #127 The Nervous System: Crash Course Biology #26 Animal Behavior: Crash Course Biology #125 Chordates: Crash Course Biology #124 Complex Animals - Annelids & Arthropods: Crash Course Biology #123.
Ecology: Crash Course Ecology #2 Quiz.
Learn why do people always try to electrostatics, crash course ecology worksheets and still growing out of wetland management. limiting factors-dependent; density-independent.
Burgess, Lauren / Unit 12: Ecology.
Your grandparents (people above 80) have watched the population of their species ______________. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection Created by Danis Marandis This ZIP file contains Microsoft Word document worksheets (along with PDF versions) for each of the twelve episodes of Crash Course Ecology hosted by Hank Green. docx - Name: Ecology – Rules for Living on Earth Crash Course Biology #40 1. It basically comes down to who is eating who. Fill in the gaps in the ecological hierarchy. The summary sheet for the fifteenth episode of Crash Course Astronomy ( thecrashcourse) is here, in which Phil Plait talks about The Red Planet! Here ’s the file And the original video Graphics are provided by @thought-cafe & all sources are cited in the description box underneath the original video. Ecological Succession: Change is Good – Crash Course Ecology #6 July 20, 2019 by Crash Course Leave a Comment — In the world of ecology, the only constant is change – but change can be. Crash Course is one of the best ways to educate yourself, your classmates, and your family on YouTube! From courses like Astronomy to US History and Anatomy & Physiology it's got you covered with an awesome variety. Crash Course: Hydrologic and Carbon Cycles Guided Viewing Worksheet 1: What are Biogeochemical Cycles? Biogeochemical cycles are pathways for molecules like water, and elements like carbon, nitrogen and phosphorous to move through all of Earth's environment and various ecosystems. Explore the amazing collection here, with new.
Crash Course Lesson Plans & Resources.
Crash Course: Ecology © 2023 Khan Academy Terms of use Privacy Policy Cookie Notice The hydrologic and carbon cycles: Always recycle! Google Classroom About Transcript Hank explains how carbon and water are recycled through ecosystems and the biosphere. Species that reproduce very quickly are called _____-selected species. 49 Zip This is a zip file that contains a Microsoft Word worksheet (along with a PDF version) to accompany the crash course video for Ecology #6. Crash Course Ecosystem Ecology Ecology - Rules for living on earth: Crash Course Biology Bozeman Animal Behavior Friday, March 27 Teacher Work Day Homework Edpuzzle Crash Couse - Nitrogen and Phosphorus Cycles Crash Course - Hydrologic and Carbon Cycles Crash Course - Ecological succession Monday, March 30 Essay Quiz. Unit 1: Intro to biology Welcome to biology! The science of biology Water and life Unit 2: Chemistry of life. Since 2011, brothers John and Hank Green have pioneered digital education with their series Crash Course on YouTube. What is theCompetitive Exclusion Principle?. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection.
Crash Course Ecosystem Ecology Worksheet Answers">Crash Course Ecosystem Ecology Worksheet Answers.
It is an interdisciplinary field that includes biology, geography, and Earth science. What are the 3 types of ecology? Population ecology, community ecology, and ecosystem ecology.
Community Ecology: Feel the Love.
Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of.
Community Ecology: Feel the Love – Crash Course Ecology #4.
Ecology – Rules for Living on Earth: Crash Course Biology #140 Fungi – Death Becomes Them: Crash Course Biology #139 The Plants & The Bees – Plant Reproduction: Crash Course Biology #138 Vascular Plants = Winning!: Crash Course Biology #137 The Reproductive Lives of Nonvascular Plants – Alternation of Generations: Crash Course Biology #136.
The hydrologic and carbon cycles: Always recycle!.
That's just the way it is, people. Community Ecology: Crash Course Ecology #4 Available at or just youtube/google “Crash Course Ecology 4” 1. Crash Course Ecology Worksheets - total of 8 printable worksheets available for this concept.
Crash Course Worksheets Science Ecology.
Crash Course Ecology 5 Community Ecology II. Crash Course Ecology Ecology Conservation and Restoration Ecology: Crash Course Ecology #12 Pollution: Crash Course Ecology #11 5 Human Impacts on the Environment: Crash Course Ecology #10 Nitrogen & Phosphorus Cycles – Always Recycle! Part 2: Crash Course Ecology #9 The Hydrologic and Carbon Cycles – Always Recycle!: Crash Course Ecology #8. Since 2011, brothers John and Hank Green have pioneered digital education with their series Crash Course on YouTube. Crash Course Ecology 5 Community Ecology II. Population ecologists group these factors into two different categories: answer choices. Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of living and nonliving things interacting in a specific place). Ecological Succession (Crash Course!) Flashcards | Quizlet Ecological Succession (Crash Course!) 5. Crash Course Ecology Worksheets - total of 8 printable worksheets available for this concept. Worksheets contain a combination of fill-in-the-blank and short answer questions.
Crash Course Ecology Teaching Resources.
Ecological Succession (Crash Course!) Flashcards.
From Science to Social Studies, Crash Course offers it all in quick-paced, imaginative videos aimed at learners of all ages. Crash Course: Biology Hank Green teaches you biology! Learn, study and understand the science of life. Worksheets are Blogging crash course, Crashcourse supply and demand crash course economics 4, Crash course history the french indian war and, Ap history crash course, Crash course world history the renaissance, Use the information in the video and your diffusion and, Santillana preliminary unit for spanish 1 vocabulary, Rda toolkit workshop a …. pdf 5 Newly uploaded documents Chapter 4 HW Written.
Ecological Succession Worksheet.
Crash Course Worksheets Ecology Teaching Resources ….
Intro to Ecology and Population Ecology (Part 1) Population. This ZIP file contains Microsoft Word document worksheets (along with PDF versions) for each of the. WELCOME TO Crash Course Crash Course is one of the best ways to educate yourself, your classmates, and your family on YouTube! From courses like Astronomy to US History and Anatomy & Physiology it's got you covered with an awesome variety of AP high school curriculum topics. Learn why do people always try to electrostatics, crash course ecology worksheets and still growing out of wetland management. crashcourse Community Ecology: Feel the Love - Crash Course Ecology #4 Info Description Transcript Expand all | Collapse all Introduction ( 0:00) I wouldn't be much of a teacher if I didn't tell you that life is tough and that everyone's looking out for themselves in this world. Crash Course Sociology Sociology Theories About Family & Marriage: Crash Course Sociology #37 Age & Aging: Crash Course Sociology #36 Racial/Ethnic Prejudice & Discrimination: Crash Course Sociology #35 Race & Ethnicity: Crash Course Sociology #34 Theories of Gender: Crash Course Sociology #33 Gender Stratification: Crash Course Sociology #32. What is population ecology? Groups within a species and how they live together in one geographic area 3. Community Ecology: Crash Course Ecology #4 Available at or just youtube/google “Crash Course Ecology 4” 1. Lesson 1: Crash Course: Biology Why carbon is everywhere Water - Liquid awesome Biological molecules - You are what you eat Eukaryopolis - The city of animal cells In da club - Membranes & transport Plant cells ATP & respiration Photosynthesis Heredity DNA, hot pockets, & the longest word ever Mitosis: Splitting up is complicated.
Crash Course Population Ecology.
Crash Course Community Ecology 1 Crash Course Community Ecology 2 Thursday, March 26 Animal Behavior and Ecosystems and Biomes Online lab - How does competition affect population growth? Homework Edpuzzle Crash Course Ecosystem Ecology Ecology - Rules for living on earth: Crash Course Biology Bozeman Animal Behavior Friday, March 27.
Human Population Growth: Crash Course Ecology #3.
I am working on in-depth worksheets to the entire Crash Course videos in Biology, Enginee Subjects: Biology, General Science, Science Grades: 6 th - 9 th Types: Activities. Lesson 1: Crash Course: Biology Why carbon is everywhere Water - Liquid awesome Biological molecules - You are what you eat Eukaryopolis - The city of animal cells In da club - Membranes & transport Plant cells ATP & respiration Photosynthesis Heredity DNA, hot pockets, & the longest word ever Mitosis: Splitting up is complicated. What is theCompetitive Exclusion Principle? When two species are competing for the same resource one of them is going to be successful and eliminate the other. A fire might alter the forest habitat so much that some species cannot survive and others can thrive. Worksheets contain a combination of fill-in-the-blank and short answer questions. From balancing chemical reactions to analyzing famous literature, never before has one collection offered such an awe-inspiring range of content. [Theme Music] Disturbances happen in ecosystems all the time, every day, a fire, a flood, a windstorm. Crash Course - “The Texas Mosquito Mystery” Note Taking Worksheet 1. It is intended for classroom use only. Crash Course Ecology Video Worksheet 3: Human Population Growth. Part 1: Ecological Succession Read the below passages and answer the corresponding questions Ecosystems Changing Ecosystems constantly change.
Unit: Crash Course: Biology and Ecology.
Crash Course Ecology #4 (Community Ecology) worksheet by Danis Marandis All Grades Crash Course Ecology #4 (Community Ecology) worksheet ; Grade Levels. ) or to share with any other teachers. Organelles-The various functional components present in cells. This 20 questions video worksheet is perfect as an introduction to ecology, for early finishers and filling time on half days, or as sub-work. crashcourse Community Ecology: Feel the Love - Crash Course Ecology #4 Info Description Transcript Expand all | Collapse all Introduction ( 0:00) I wouldn't be much of a teacher if I didn't tell you that life is tough and that everyone's looking out for themselves in this world. This 15 episode series is part of the Study Hall Program; a partnership between Crash Course and ASU. Crash Course: Biology Hank Green teaches you biology! Learn, study and understand the science of life. 156 Resources Sort By Lesson Crash Course: Computer Science Videos Grades 3-8 Read More Lesson Romeo and Juliet: Crash Course Videos Grades 9-12 Read More Lesson Crash Course: Government Basics and the Court System Grades 9-12 Read More Lesson Always Recycle! Part 2/2 Grades 9-12 Read More Lesson Always Recycle! Part 1/2 Grades 9-12 Read More. Previous Courses; Links; Navigation. Crash Course Community Ecology 1 Crash Course Community Ecology 2 Thursday, March 26 Animal Behavior and Ecosystems and Biomes Online lab - How does competition affect population growth? Homework Edpuzzle Crash Course Ecosystem Ecology Ecology - Rules for living on earth: Crash Course Biology Bozeman Animal Behavior Friday, March 27. dispersion-dependent; density-independent. video Crash Course Ecology - key terms limiting factors, carrying capacity, trophic levels, bioaccumulation; Thurs Sept 17. Some of the worksheets displayed are Crash course answer key, The ups and downs of populations, Handout. Crash Course-Ecology 3. answer choices community ecology ecosystem ecology population ecology photography ecology Question 3 900 seconds Q.
Crash Course Worksheets">Crash Course Worksheets.
doc">Crash Course Ecology 4 Community Ecology.
Key Term crash course ecology #7 worksheet answers; This preview shows page 1 - 2 out of 2 pages. Worksheets are Crash course answer key, The ups and down. This selection of 12 worksheets covers the field of ecology, including the history of Earth, ecosystems, biodiversity, population ecology, community ecology, predators, human impacts, pollution, ecological succession, biogeochemical cycles, and conservation and restoratio Subjects: Biology, Earth Sciences, Science Grades: 8th - 10th Types:. Previous Courses; Links; Navigation. 4 (5 reviews) General: Population Ecology Click the card to flip 👆 Most Zoomed in: look at groups within a species and see how they live together in one geographic area. After these unpredictable events, ecologists kept seeing predictable, even orderly, changes in. 49 Zip This is a zip file that contains a Microsoft Word worksheet (along with a PDF version) to accompany the crash course video for Ecology #6. Crash Course Ecology Worksheets Complete Series Set Full Bundle Collection. Questions Tips & Thanks Want to join the conversation? Sort by: Top Voted.
5 human impacts on the environment (video).
Click the card to flip 👆 1 / 31 Flashcards Learn Test Match Created by mccauley3606 Terms in this set (31) General: Population Ecology.
Crash Course Sociology">Crash Course Sociology.
Name: Ecology – Rules for Living on Earth Crash Course Biology #40 1. Crash Course Ecology #6 (Ecological Succession) worksheet by Danis Marandis 14 $1. and collaborating with biologists like E. From Science to Social Studies, Crash Course offers it all in quick-paced, imaginative videos aimed at learners of all ages. Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a. Science Biology library Welcome to the Biology library! Biology is the study of life. Identified in 1934 andwas identified by pitting one species against another, watching one species draw another species to extinction. 2: What is a Reservoir of water?. Species that reproduce very quickly are called _____-selected. Crash Course Ecology #6 (Ecological Succession) worksheet by Danis Marandis 14 $1. The summary sheet for the fifteenth episode of Crash Course Astronomy ( thecrashcourse) is here, in which Phil Plait talks about The Red Planet! Here ’s the file And the original video Graphics are provided by @thought-cafe & all sources are cited in the description box underneath the original video. This ZIP file contains Microsoft Word document worksheets (along with PDF versions) for each of the twelve episodes of Crash Course Ecology hosted by Hank Green. Whenever species compete, they’re going after the _____ _____ that they need for their survival and continued population growth. From balancing chemical reactions to analyzing famous literature, never before has one collection offered such an awe-inspiring range of content. Ecological Succession (Crash Course!) Flashcards | Quizlet Ecological Succession (Crash Course!) 5. Worksheets are Crash course answer key, The ups and down Crash. Unit 1: Intro to biology Welcome to biology! The science of biology Water and life Unit 2: Chemistry of life Elements and atoms Electron shells and orbitals Chemical bonds and reactions Unit 3: Water, acids, and bases Hydrogen bonding in water Cohesion and adhesion Temperature and state changes in water Acids, bases, and pH. doc 2 BiologyVideoGuideCrashCourseEcology3HumanPopulationGrowth 2 Crash Course Ecology 5 Community Ecology II. From Science to Social Studies, Crash Course offers it all in quick-paced, imaginative videos aimed at learners of all ages. Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of living and nonliving things interacting in a specific place). Topics covered range from: taxonomy, systems, biological molecules,. Human Population Growth: Crash Course Ecology #3 Back to Courses Human Population Growth: Crash Course Ecology #3 If being alive on Earth were a contest,. If competitive exclusion is the natural law of the land, then why isn’t. Topics covered range from: taxonomy, systems, biological molecules, photosynthesis, evolution, animals, plants, anatomy, and ecology. answer choices community ecology ecosystem ecology population ecology photography ecology Question 3 900 seconds Q.