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Dolphins grow and develop by drinking mother milk and stay near them for and about 2 to 3 years. They grow about 3 meters long.

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A dolphin is biologically organized by cells

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Dolphins and homeostasis.Homeostasis: Homeostasis is to maintain a stable equilibrium. For example more than half of a human's body weight percentage is water, and maintaining the correct balance of water is an example of homeostasis.

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They are mammals and breathe with lungs, just like all mammals do. How long can they hold their breath? As long as 15 minutes. By contrast sperm whales can stay down as long as an hour or more.

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Dolphins have all five senses of touch, smell, taste, hearing and sight just like humans. However some of their senses are more developed than humans, especially their sense of hearing. They are able to hear sounds with much higher frequencies than humans can and they use this as a method of echo location to find food and their way around the ocean. Dolphins are able to see well in both air and water. This is good for hunting flying fish by tracking them. There sense of smell may be restricted. Dolphins use their sense of smell to help themselves find food and they might be able to taste chemicals released by other dolphins which gives clues to their availability for mating. The sense of touch is very important in the social life for a dolphin. Touching and stroking are the main parts of dating, and mothers and their calves touch regularly to maintain their close bond.

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These adaptations enable a dolphin to conserve oxygen. Dolphins, like other marine mammals, have a slower heart rate while diving. During a dive, blood is shunted away from tissues tolerant of low oxygen levels toward the heart and brain, which require a constant supply of oxygen.

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The age of maturity for dolphins varies significantly based on many factors. The location where they live, the temperature of the water, food sources, and even the species all play a factor. For females, that age can range from 5 to 13. For males it is often much later with the range being from 9 to 14 years of age