Animals are multicellular, eukary0tic 0rganisms 0f the kingd0m Animalia . The animal kingd0m emerged as a clade within Ap0ik0z0a as the sister gr0up t0 the ch0an0flagellates. Animals are m0tile, meaning they can m0ve sp0ntane0usly and independently at s0me p0int in their lives.
Their b0dy plan eventually bec0mes fixed as they devel0p, alth0ugh s0me underg0 a pr0cess 0f metam0rph0sis later in their lives. All animals are heter0tr0phs: they must ingest 0ther 0rganisms 0r their pr0ducts f0r sustenance. M0st kn0wn animal phyla appeared in the f0ssil rec0rd as marine species during the Cambrian expl0si0n, ab0ut 542 milli0n years ag0.
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Animals can be divided br0adly int0 vertebrates and invertebrates. Vertebrates have a backb0ne 0r spine, and am0unt t0 less than five percent 0f all described animal species. They include fish, amphibians, reptiles, birds and mammals. The remaining animals are the invertebrates, which lack a backb0ne. These include m0lluscs ; arthr0p0ds ; annelids, nemat0des, flatw0rms, cnidarians, cten0ph0res, and sp0nge
The study 0f animals is called z00l0gy. Etym0l0gy The w0rd “animal” c0mes fr0m the Latin ”, meaning having breath, having s0ul 0r living being”. In everyday n0n-scientific usage the w0rd excludes humans – that is, “animal” is 0ften used t0 refer 0nly t0 n0n-human members 0f the kingd0m Animalia; 0ften, 0nly cl0ser relatives 0f humans such as mammals and 0ther vertebrates, are meant. The bi0l0gical definiti0n 0f the w0rd refers t0 all members 0f the kingd0m Animalia, enc0mpassing creatures as diverse as sp0nges, jellyfish, insects, and humans.
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