all the living and nonliving parts in a certain area, ecosystem, community, all the living parts of an ecosystem, abiotic, biotic, all the nonliving parts of an ecosystem, abiotic, biotic, an organism that makes its own food using energy from the sun, producer, consumer, organisms that get energy from breaking down dead organisms, consumer, decomposer, organisms that cannot produce their own food and have to eat other organisms, consumer, decomposer, shows how matter and energy move from one organism to another, food chain, food web, a series of changes in a community, ecosystem, succession, when two organisms need the same resources, succession, competition, an unchanging ecosystem, stable, unstable.

Topic 3

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恢復自動保存: ?