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.

Question

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.

Quizplus · Accepted Answer

The convergence in external morphology of sharks, penguins, and porpoises is attributed to selection pressures that are common to these groups, such as the need for streamlined bodies and efficient locomotion in their aquatic environments.

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