1. These animals share similar morphological feature. For example, their head adopt similar shapes and their teeth look similar. One can also see the gradual change in their feet. At first, webs grow out, and then they evolved into fin like structures. They don't need hind legs anymore since they swim in water, so the hind legs gradually shrank.
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3. They show the convergent evolution because they evolved from different species but they all developed body structures with similar functions that enable them to fly. Although these body structures have different internals, they provide the same function.
4. The more similar the two DNA patterns are, the more likely evolution process is involved between the two species. For example, chimpanzee DNA and human DNA share more than 97% similarity; therefore, chimpanzee and human are very likely to share the same common ancestor.
5. Homology means the body structure of animals are similar. For example, a lot of animals share the same arm structures. These animals that share homologous body structures most likely evolved from a common ancestor.
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