Animal Kingdom Defining Features
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Animals are multicellular heterotrophs lacking cell walls, most reproducing sexually and passing through a blastula stage in embryonic development.
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A sponge and a human both develop from a hollow blastula, share no cell wall, and get nutrients by consuming other organisms.
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"Multicellular heterotroph" alone does not define animals — fungi are multicellular heterotrophs too, but feed by absorption, lacking a blastula.