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.
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.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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.

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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