STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
MORPHOLOGY OF ANIMALS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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vestigial structure
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analogous structure
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homologous structure
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None of the above
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Detailed explanation-1: -1: Whale Skeleton: The pelvic bones in whales are also a good example of vestigial evolution (whales evolved from four-legged land mammals and secondarily lost their hind legs).
Detailed explanation-2: -For example, whales have pelvic bones which are unused and therefore vestigial, but the presence of the pelvic bone suggests a time in the past where whales were in a position (possibly on land) to use that bone, revealing part of their history-a “trace".
Detailed explanation-3: -The pelvic bones of whales are “one of the classic examples of a vestigial structure, ” said Otárola-Castillo. “But what we found was that the shapes of these bones are highly associated with the mating systems of these whales and dolphins-species that are more promiscuous have more-complex-shaped pelves.”
Detailed explanation-4: -Evidence for Evolution: These structures, such as the pelvis and femur in whales, are evidence for evolution, that we evolved over time through natural selection from ancestors that had different traits.
Detailed explanation-5: -Common examples of vestigial structures are the hip bones that remain in snakes and whales. At a time, these species had ancestors that had limbs that required hips for mobility.