Reading the following passage and choose the option (A, B, C or D) that best answers each of the questions below.
Dolphins are mammals that live in the ocean. Mammals are different that fish, 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.
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