Analogy
Two structures in biology are said to be analogous if they perform a similar function by a similar mechanism, but did not arise from a common ancestor performing that function: for example, the wings of insects and the wings of birds. These similar structures most likely evolved through different pathways, a process known as convergent evolution.
The concept of analogy is contrasted with that of homology, which refers to two structures that share a common ancestor. They may retain the function of the common ancestor, or they may have evolved to fulfil quite distinct functions.
The concept of analogy is contrasted with that of homology, which refers to two structures that share a common ancestor. They may retain the function of the common ancestor, or they may have evolved to fulfil quite distinct functions.
Source: wikipedia, under GFDL
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