GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have feathers.
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They have hair on their bodies.
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They breathe with their gills.
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Females feed their young with milk.
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Most of them have scales.
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Detailed explanation-1: -All fish share two traits: they live in water and they have a backbone-they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one another. Fin fish like salmon have gills, are covered in scales, and reproduce by laying eggs.
Detailed explanation-2: -Many fish have an outer covering of scales. Scales protect fish, much like a suit of armor. All fish have a slimy covering of mucus. This substance allows the fish to swim through the water with very little drag and also makes it difficult for other organism to attach to the fish.
Detailed explanation-3: -Ectothermic. Lateral line. Two chambered heart. Gills used for respiration. No external ears. No eye lids.