EVOLUTION
EVIDENCE FOR EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They provide evidence that organisms can improve the functions of their organs over time.
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They are found only in extinct organisms, thus providing evidence that an organism must evolve to survive.
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They are similar to organs in other species but serve different functions, thus providing evidence that species are closely related.
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They are reduced in size and function in living organisms compared to the organisms’ ancestors, thus providing evidence that organisms change over time.
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Detailed explanation-1: -A vestigial structure is a biological structure that has lost a major ancestral function and is usually drastically reduced in size.
Detailed explanation-2: -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-3: -Vestigial Structures Evolution has reduced their size because the structures are no longer used. The human appendix is another example of a vestigial structure.
Detailed explanation-4: -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.