The Convergence in External Morphology of Sharks,penguins,and Porpoises Is Attributed

question 30

Multiple Choice

The convergence in external morphology of sharks,penguins,and porpoises is attributed to  

• A) reduced genetic variability in these groups.
• B) selection pressures that are common to these groups.
• C) reproductive isolation of these groups.
• D) identical genes in all three groups.
• E) use and disuse of the limbs.

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