However the hot times were created and sustained, Earth’s life reveled in the conditions. Similar to reptiles' beating the heat and migrating into the oceans, some mammals did the same thing about 200 million years later, and . Scientists were surprised when molecular studies found that with , and the is the closest living relative to whales. Whales evolved in and near India, beginning about 50 mya, when the earliest “whale” and lived near water. By 49 mya, . A few million years later , and by 41 mya they , for a transition from land to sea that “only” took eight million years. Whales quickly became dominant marine predators. However, sharks did not go quietly and began an arms race with whales, which culminated 28 mya in , the most fearsome marine predator ever: a shark reaching nearly 20 meters in length and weighing 50 metric tons. , as seen below ( in gray, great white shark in green, and next to that is a man taking a break in mouth). (Source: Wikimedia Commons)


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