Comparative morphology and anatomy study the similarities and differences in the external and internal structure of organisms of different systematic groups. It turned out that organs of some animals and plants, different in form and function, can have a general structural plan and develop similar embryonic primordia. Such, for example, are the limbs of different vertebrates or externally different wings of insects, for example, locusts, beetles, butterflies and ants. The more similar features in the structure of the organs of the compared organisms, the closer they are on the evolutionary tree.
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