OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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examples of fossils
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vestigial structures
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acquired traits
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examples of natural variation
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Detailed explanation-1: -Answer and Explanation: The pelvis and femur in whales are considered vestigial structures. These structures were inherited from ancestors that had a use for them, but are no longer used today.
Detailed explanation-2: -We call these unused structures without function vestigial structures. Other examples of vestigial structures are wings on flightless birds, leaves on some cacti, and hind leg bones in whales.
Detailed explanation-3: -Researchers studying the pelvic bones of dolphins and whales reveal that these seemingly useless remnants of an ancient landlubber lifestyle actually have a purpose. Turns out, cetacean pelvic bones help control the motion of the ocean, and their size and shape are likely influenced by the forces of sexual selection.