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You and all organisms（生物體，有機體） live an environment. An environment is made up of（由……組成） everything that surrounds an organism. It can include the air, the water, the soil, and even other organisms.
An organism responds to（響應，反應） changes in its environment. When an organism responds to a change, it reacts in certain ways. All living things respond in some way.
Have you ever noticed how plants and insects respond to light? Plants bend toward light. Insects fly toward light.
Living things also respond in other ways. The leaves on some trees respond to a change in season. In autumn, they change colors and then fall off the branches. Animals also respond to a change in season. Squirrels save nuts for the winter. Bears sleep through the winter in a cave.
You respond to your environment in many ways, too. You may shiver（顫抖，打哆嗦） if you are cold. What other ways do you respond to changes in your environment?