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region with no trees, few plants, and permanently frozen soil

The tundra is one of the coldest and driest places on Earth.


the average weather in an area over a period of many years

The climate of the African desert is very hot and dry.


all the living and nonliving things that interact with each other in a particular place

A frog, the insects it eats, and the water it lives in are all part of the same ecosystem.


to move between regions

In the winter, many birds migrate to warmer areas in the south.


having characteristics that make it easier to survive in a certain environment

White fur that blends in with their surroundings makes polar bears well-adapted to life in the snow.

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