Refer to the Figure Shown Here

question 18

Multiple Choice

Refer to the figure shown here. Which of the following would have been a selective agent or pressure that could lead to the reduction in hindlimbs through time?

• A) The animal's body size was too heavy to support the weight on land and hindlimbs were no longer useful.
• B) More emphasis was placed on flexing the backbone than on paddling with hindlimbs for swimming.
• C) Appendages cause resistance, or drag, when moving through water.
• D) With the increased size of the tail and its use in swimming, the hindlimbs were not as necessary.
• E) All of the above answers describe selective agents or pressures that could have led to the reduction in hind limbs over time.

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