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Welcome to Your World imageLesson guide image map
Work through all of the topics in the lesson guide, then continue to the activity and posttest.
The Environment

The environment is the sum of all external conditions affecting the life, development and survival of an organism.

An ecosystem is the interacting system of a biological community and its non-living environmental surroundings. Ecosystems have two essential functions.

  1. Ecosystems enable the energy from the sun to travel through all the levels of the food chain.
  2. Ecosystems allow for matter to be recycled.

The next few pages in this lesson will introduce you to the energy and food functions of the environment, the chemical cycles in the environment, and how various hazards effect the environment.


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