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science genetics acquired traits inherited traits traits cells classification density heredity body systems aristotle domains carl linnaeus vocabulary kingdom camouflage reproduction adaptations scaffolding mass volume review natural selection structure education matter states of matter mendel organs what is it? diffusion osmosis biology dichotomous keys classification systems phylum order domain species science 7 class genus family taxonomy observations once living non-living living hybridization adaptability of organisms darwin's theory of evolution mimicry gregor mendel cell tonicity hypotonic hypertonic isotonic earth erosion weathering deposition