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In building a phylogenetic tree, biologists look for traits derived from a common ancestor. To use this form of analysis with the utmost fidelity, scientists must differentiate homologous traits from convergent ones.

Which of the following would be considered a homologous trait?

A

The wings of birds and bats.

B

The ability of birds and dolphins to echolocate.

C

The streamlined body form of fish and dolphins.

D

The amniotic membrane in birds and mammals.

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