a single zebra , Organism (savannah), a group of zebras , Population (savannah), all living things in the savannah , Community (savannah), all living and nonliving things in the savannah, Ecosystem (savannah), a single turtle, Organism (ocean), a group of turtles , Population (ocean), all living things in the ocean, Community (ocean), all living and nonliving things in the ocean, Ecosystem (ocean), all living and nonliving things in the arctic, Ecosystem (arctic), all living things in the arctic , Community (arctic), a group of polar bears , Population (arctic), a single polar bear , Organism (arctic).

Ecosystems

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