cell, nucleus, prokaryotic, eukaryotic, unicellular, multicellular, organism, classify, characteristic, ecosystem, biotic, abiotic, levels of organization, population, community, organism, ecosystem, biosphere, classify, characteristic
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6.12A: understand that all organisms are composed of one or more cells.
6.12E: describe biotic and abiotic parts of an ecosystem in which organisms interact.
6.12F: diagram the levels of organization within an ecosystem, including organism, population, community, and ecosystem.