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Dolphins are mammals that live in the ocean. Mammals are different than fi sh, reptiles or birds. As a mammal, dolphins breathe oxygen, even though they live in water. Because they are mammals, a dolphin mother gives birth to a live baby, unlike reptiles and birds who lay eggs. A dolphin mother also feeds her baby milk like other mammals.
What is the main idea? Evidence to support it?
A dolphin is a mammal
breathe oxygen, give birth to live baby, feed baby milk