Ecology

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Communities -- QH541 .C66 1992

Observes a variety of food chains in shallow and deep-water habitats. Explains the difference between an ordinary food chain and a detritus food chain.

Populations -- QH352 .P66 1992

Discovers that there are limits to any population's growth including environmental and biological factors. Realizes that human settlements have affected other populations, increasing some while endangering others.

Food chains -- QH541 .F66 1992

Observes a variety of food chains in shallow and deep-water habitats. Identifies primary producers, primary consumers and secondary consumers in several food chains.

Nutrient cycles -- QH541 .N8 1992

Essential elements move in nutrient cycles, from the environment into the bodies of a succession of living things, then back to the environment. Observes this process on a mountain plateau, in a rain forest, in a mangrove swamp, and on the floor of the ocean.

Succession -- QH541.5.S26 S8 1992

When a habitat is disturbed, its old community of plants and animals may die to be replaced by waves of colonization and regrowth. Follows the plant and animal succession that transforms a barren beach into a wooded sand dune and a farmer's field into a climax woodland community.