what are the special adaptation that help fish survive in water ?
Answers
Answer:
Fish have gills that allow them to “breathe” oxygen in water. Water enters the mouth, passes over the gills, and exits the body through a special opening. Gills absorb oxygen from the water as it passes over them. Fish have a stream-lined body.
Answer:
Explanation:
Fish, like us and all other animals, need a constant supply of oxygen to survive. Our atmosphere is about 20 percent oxygen, so we simply take it in through our lungs. Lungs are useless underwater, however, as anyone who has nearly drowned can readily and breathlessly attest -- even dolphins and whales need to take in oxygen from the atmosphere to survive. Gills enable fish to absorb oxygen from the water. Fish do not chemically break down water, H2O, to derive oxygen. They absorb O2 that is dissolved in the water. There are only about 4 to 8 parts per million of oxygen in water, compared to the 20 percent in the atmosphere we lung-breathing creatures enjoy.