<Tr> <Td_colspan="2"> <Ul> <Li> Metazoa </Li> </Ul> </Td> </Tr> <Ul> <Li> Metazoa </Li> </Ul> <P> Animals are eukaryotic, multicellular organisms that form the biological kingdom Animalia . With few exceptions, animals are motile (able to move), heterotrophic (consume organic material), reproduce sexually, and their embryonic development includes a blastula stage . The body plan of the animal derives from this blastula, differentiating specialized tissues and organs as it develops; this plan eventually becomes fixed, although some undergo metamorphosis at some stage in their lives . </P> <P> Zoology is the study of animals . Currently there are over 66 thousand (less than 5% of all animals) vertebrate species, and over 1.3 million (over 95% of all animals) invertebrate species in existence . Classification of animals into groups (taxonomy) is accomplished using either the hierarchical Linnaean system; or cladistics, which displays diagrams (phylogenetic trees) called cladograms to show relationships based on the evolutionary principle of the most recent common ancestor . Some recent classifications based on modern cladistics have explicitly abandoned the term "kingdom", noting that the traditional kingdoms are not monophyletic, i.e., do not consist of all the descendants of a common ancestor . </P>

What characteristics do all the organisms in the animal kingdom share
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