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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ISBN:9781947172517
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Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter29: Vertebrates
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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.
Present
10 MYA
Modern toothed whales
20 MYA
The reduced hind limbs of
Rodhocetus kasrani could not have
aided it in walking or swimming.
Rodhocetus swam with an up-and-down
motion, as do modern whales.
30 MYA
40 MYA
Ambulocetus natans
probably walked on land (as do
modern sea lions) and swam by
flexing its backbone and paddling with
its hind limbs (as do modern otters).
50 MYA
60 MYA
Hypothetical
mesonychid
skeleton
Transcribed Image Text:Present 10 MYA Modern toothed whales 20 MYA The reduced hind limbs of Rodhocetus kasrani could not have aided it in walking or swimming. Rodhocetus swam with an up-and-down motion, as do modern whales. 30 MYA 40 MYA Ambulocetus natans probably walked on land (as do modern sea lions) and swam by flexing its backbone and paddling with its hind limbs (as do modern otters). 50 MYA 60 MYA Hypothetical mesonychid skeleton
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