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NGSS: HS‑LS2.A
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Ecology introductionEcosystems and biomesEcological levels: from individuals to ecosystemsIntroduction to ecology review
Practice
Introduction to ecologyGet 3 of 4 questions to level up!
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Population size, density, & dispersalExponential and logistic growth in populationsPopulation regulationPopulation ecology review
Practice
Population ecologyGet 5 of 7 questions to level up!
NGSS: HS‑LS2.C
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Ecosystem biodiversityEcosystems and ecological networksCommunity structureIntroduced species and biodiversityEcological successionCommunity ecology review
Practice
Community ecologyGet 3 of 4 questions to level up!
NGSS: HS‑LS2.A
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Interactions between populationsEcological interactionsPredator-prey cyclesEcological relationships review
Practice
Ecological relationshipsGet 3 of 4 questions to level up!
NGSS: HS‑LS2.B
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Flow of energy and matter through ecosystemsFood chains & food websExample identifying roles in a food webEnergy flow and primary productivityTrophic levels review
Practice
Trophic levelsGet 3 of 4 questions to level up!
NGSS: HS‑LS2.B
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Biogeochemical cycles overviewThe water cycleThe carbon cycleThe nitrogen cycleBiogeochemical cycles review
Practice
Biogeochemical cyclesGet 3 of 4 questions to level up!
NGSS: HS‑LS2.C, HS‑LS4.D
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Human activities that threaten biodiversityWhat is a biodiversity hotspot?Conservation and the race to save biodiversityIntroduced species and biodiversityHow does climate change affect biodiversity?Protecting biodiversity: the power of the individualProtecting biodiversity: local and global policiesHuman impact on ecosystems review
Practice
Human impact on ecosystemsGet 3 of 4 questions to level up!

About this unit

Why are polar bears found only in the Arctic? Why does mildew grow in your shower and not (hopefully) in your sock drawer? Learn how ecologists study the interactions between organisms and their environment, and how these interactions affect where, and in what numbers, different types of organisms are found.
Biology is brought to you with support from the Amgen Foundation