through all of the topics in the lesson guide, then continue
to the activity and posttest.
is the sum of all external conditions affecting the life, development
and survival of an organism.
is the interacting system of a biological community and its non-living
environmental surroundings. Ecosystems have two essential functions.
enable the energy from the sun to travel through all the levels
of the food chain.
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.