What does dolphin need to survive?
Dolphins survive in many ways but be specific. Do you mean how they survive from prey or survive in sleep? Dolphins survive from prey by pretending they are dead, or they can swim in schools. Dolphins survive in the water by turning half there brain of when they sleep so they can still see out of one eye.
Obviously,a mother dolphin tries to protect her baby, in any way possible. (Without her the baby dolphin will be defenseless against predators) She will teach her offspring how to survive, and what they need to do. She will teach her offspring where to find the necessary food and the way of life in the ocean.
The dolphin must have access to food and water, to allow it to carry out the necessary life processes to survive. For example: movement, respiration, growth, and reproduction. Dolphins must also live in an unpolluted body of water, as pollution will slowly poison them and their food source (for example, the Baiji river dolphin of China, now extinct due to pollution). Some dolphin species can inhabit either fresh or salt water.