In this interactive activity from the American Museum of Natural History, play "connect the dots" and discover the connections between the people, animals, and plants in three habitats of the Dzanga-Sangha rain forest in the Central African Republic.

Resource takes an exploratory look at Grant's Gazelle. Content includes information on this gazelle's physical characteristics, habitat, behavior, diet, caring for the young, and predators.

See the many birds that spend their summer in the Arctic in this video segment from Nature.

This video segment from the Nevada Department of Wildlife looks at various species of bats and how they impact the environment.

This video segment from the Nevada Department of Wildlife looks at various species of bats and how they impact the environment. [3:14]

This Nature video segment focuses on the four foods most important to the grizzly bears' survival, and it describes the threats to the supply of each of them.

In this video segment from Nature, learn about the problems bears are creating on ranch land surrounding Yellowstone National Park.

This Nature video segment explores how the relationship between humans and grizzly bears has changed over the course of American History, and it describes the closing of the Yellowstone National Park garbage dumps in the 1970s.

Learn about the precautions humans must take in the face of a growing grizzly bear population in this video from Nature.

This video segment explores the world of the beaver, including the biology of the species and, more importantly, its ability to transform an ecosystem for its own benefit.

This comprehensive study guide covers the main terms and concepts needed for a unit on biomes.

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Introduction to ecosystems and other ecological concepts.

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Introduction to ecosystems and other ecological concepts.

A free CK-12 account is required to view all materials.

Introduction to ecosystems and other ecological concepts.

A free CK-12 account is required to view all materials.

How organisms are organized.

A free CK-12 account is required to view all materials.

This ZOOMSci video segment shows how to create self-contained environments and explore how plants grow under different conditions. [3:24]

In this video, Paul Andersen explains how ecosystems respond to disruptions. Disruptions can cause changes in the number and variety of organisms. It can also lead to migration, extinction or even speciation. Ecosystems that have higher biodiversity are able to respond to large disruptions over time. [6:52]

Paul Andersen explains how ecosystems function. He begins with a description of how life on the planet is ordered from large to small in biomes, ecosystems, communities, population, and individuals. He describes the major terrestrial and aquatic biomes on the planet. [11:14]

Paul Andersen explains how the Earth's climate will natural change due to interactions between the Sun and Earth, volcanism, and plate tectonics. Species may go extinct leading to adaptive radiation or may move to a suitable climate. Primary and secondary succession are also discussed. [6:38]

In this interactive activity from Shedd Aquarium, build a fish and then release it into the reef to search for food and evade predators. Try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.