SCIENCE
Ruth, Maria Mudd

The Mississippi River

(3) 4-6 Ecosystems of North America series. These books explore an ecosystem by examining its subsystems (e.g., the upper, middle, and lower canopies, understory, and floor of a rainforest). The accessible texts illustrate how living and nonliving components interact and affect one another; how plants and animals adapt to their surroundings; and how people have damaged and now try to sustain these ecosystems. Clear color photographs illustrate the books. Bib., glos., ind.

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