Earth Science Qeustion

Science
Tutor: None Selected Time limit: 1 Day

The human arm, cat forelimb, bat wing, and whale front flipper are all structurally similar, even though these structures serve different purposes for each animal. What is this called and how is it evidence for evolution?

Dec 11th, 2014

Homologous structures. They're evidence in the sense that organisms with homologous structures are thought to be descended from a common ancestor. It's good evidence because it follows the nested pattern of common descent. All mammals have similarly structured arms, so bats' wings are made up of fingers. But birds are not descended from mammals, and their wings are completely different: the underlying limb structures are the same, but the way they make wings are not.

Dec 11th, 2014

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Dec 11th, 2014
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