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ID: 3166951 • Letter: I
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It would be nice if you could type the answer and actually answer the question with enough meat that others can understand clearly.
Dolphins are mammals that evolved from animals that used to live on the land. Scientists believe that dolphins evolved from a hoofed, land-living mammal called Mesonyx, and returned to live in the seas some fifty million years ago. If all tetrapod limbs share a common blueprint and develop through the same signaling pathways, HOW did this evolution from a land animal to a sea animal occur? In other words, how did this common blueprint have to be altered to allow this evolution?Explanation / Answer
Dolphins are beleived to have evolved from a terrestrial animal known as mesonyx some 50 million years ago. Mesonyx lived in the warm climates of North America and they went into sea to look for its prey. Mesonyx had forelimbs and hindlimbs to support its weight. Over the course of years, it became more adapted to life in the water. Forelimbs became pectoral flippers and hindlimbs began to disappear. The hairs present on its skin started disappearing as hairless skin is more hydrodynamic. All these processes are as a result of natural selection and survival of the fittest principle.
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