How does the existence of homologous structures in present day vertebrates support the theory of organic evolution?

How does the existence of homologous structures in present day vertebrates support the theory of organic evolution?

Homologous structures are those which have the same basic form but perform the different functions. Examples in the present day vertebrates include the pentadactyl limb of the land vertebrates, eye, etc. they support the theory of organic evolution because they manifest the fact that organism which possess them are related and have thus originated from a common ancestry in the past.

The differences in them show evolution can be divergent suiting them to different function and thus different habitants and the fact that similarities remain among them is evidence that evolution has not occurred by sudden appearance of new form (as other theories suggest) but slight modification of the existing ones which is in agreement with the theory of organic evolution.

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