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Dolphins can hold their breath for. . .
Unlike humans, dolphins have to think about their breathing, so they do not sleep or dream like we do. If they did, they would suffocate and drown. Scientists believe that dolphins evolved from. . . Although scientists believe that land animals evolved from sea animals, dolphins are some of the very few sea animals that evolved from land animals. About 60 million years ago, the dolphin ancestor Mesonychid condolarth, a wolflike creature with hooves, lived on land.