[["In the ocean ", 12.0], ["The megalodon was a top of-the-food-chain predator. It fed on other big marine mammals, like whales and dolphins. It probably ate other sharks too. Cold waters may have killed the megalodon shark: Around 3.6 million years ago, as Earth entered a period of global cooling megalodons went extinct.", 1.0]]
how did the megalodon live
animals