6.1a Green plants are producers because they provide the basic food supply for them-
selves and animals.
6.1b All animals depend on plants. Some animals (predators) eat other animals (prey).
6.1c Animals that eat plants for food may in turn become food for other animals. This
sequence is called a food chain.
6.1d Decomposers are living things that play a vital role in recycling nutrients.
6.1e An organism s pattern of behavior is related to the nature of that organism s envi-
ronment, including the kinds and numbers of other organisms present, the availability
of food and other resources, and the physical characteristics of the environment.
6.1f When the environment changes, some plants and animals survive and reproduce,
and others die or move to new locations.