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Home Q & A Board Biology-Related Homework Help General Biology
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woahjenjen woahjenjen
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6 years ago
Describe the fossil and embryological evidence for the terrestrial origins of cetaceans.
 
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6 years ago
Fossil records show massive animals, with four limbs, that resemble modern day whales. Other evidence is observed in modern cetaceans. First, the embryos of whales, like all mammals, have four limbs. The hindlimbs eventually disappear during the development of the embryo and all that remains is an obsolete pelvic girdle. The embryos of whales also show a normal mammalian nostril arrangement, but this does not persist, as the nostrils migrate to the dorsal side of the animals to become the blow holes.
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