Organisms that live rooted to one spot are sessile and those that move around are motile.Most animals are capable of complex and relatively rapid movement compared to plants and other organisms.Animal Phyla- Biologists recognize about 36 separate phyla within the Kingdom Animalia.About 800,000 species have been identified.Somewhere around 9 or 10 million species of animals inhabit the earth.Most animals ingest their food and then digest it in some kind of internal cavity.Simple animals can regenerate or grow back missing parts. Adult animals develop from embryos: small masses of unspecialized cells.All animals are multicellular, eukaryotic heterotrophs -they have multiple cells with mitochondria and they rely on other organisms for their nourishment.Living things maintain an internal environment.
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