March 1, 2015

Animals are multicellular, eukaryotic organisms of the kingdom Animalia (also called Metazoa). Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their lives. All animals are motile, meaning they can move spontaneously and independently, at some point in their lives. All animals are heterotrophs: they must ingest other organisms or their products for sustenance.

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