OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Possums and monkeys are more closely related to each other than to humans
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Possums, monkeys and humans have a common ancestor
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Monkeys and humans do not share a common ancestor
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These analogous structures do not support any evolutionary relationship
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Detailed explanation-1: -Vestigial structures serve little or no present purpose for an organism. The human tail, which is reduced to the tailbone during development, is one example. Vestigial structures can provide insights into an organism’s ancestry.
Detailed explanation-2: -These unused structures without function are called vestigial structures. Other examples of vestigial structures are wings (which may have other functions) on flightless birds like the ostrich, leaves on some cacti, traces of pelvic bones in whales, and the sightless eyes of cave animals.
Detailed explanation-3: -For example, the bones in the appendages of a human, dog, bird, and whale all share the same overall construction (Figure 2) resulting from their origin in the appendages of a common ancestor.
Detailed explanation-4: -Structures that have lost their use through evolution are called vestigial structures. They provide evidence for evolution because they suggest that an organism changed from using the structure to not using the structure, or using it for a different purpose.
Detailed explanation-5: -Organs or parts of the body that no longer serve a function are called vestigial structures. They provide evidence that the species is still changing. Even humans have vestigial structures. The human appendix is one such example.