March 2, 2015

Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular,[5] which separates them from bacteria and most protists. They are heterotrophic,[6] generally digesting food in an internal chamber, which separates them from plants and algae.[7] They are also distinguished from plants, algae, and fungi by lacking rigid cell walls.[8] All animals are motile,[9] if only at certain life stages. In most animals, embryos pass through a blastula stage,[10] which is a characteristic exclusive to animals.

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