![]() ![]() 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. Currently there are over 66,000 (less than 5% of all animals) vertebrate species, and over 1.3 million (over 95% of all animals) invertebrate species in existence. 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. With few exceptions, animals are motile (able to move), heterotrophic (consume organic material), reproduce sexually, and their embryonic development includes a blastula stage. ![]() B A Refresher on How to Use The MicroscopeĪnimals are eukaryotic, multicellular organisms that form the biological kingdom Animalia.A Explanations of Important Terms And Concepts.14.8 Mammalian reproductive organs and gametes.14.2 Embryogenesis and Embryonic development.14 Reproduction in Animals and Gametogenesis.13.20 Comparison of Vertebrate Skeletons.13.19 Locate the following bones of the human skeleton:.10 Echinodermata, Hemichordata and Chordata. ![]()
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