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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?


The wings of birds and bats.


The ability of birds and dolphins to echolocate.


The streamlined body form of fish and dolphins.


The amniotic membrane in birds and mammals.

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