how did fins and gills help a fish
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The gills (found under the gill covers) allow the fish to breath. As water moves over the surface of the gills, oxygen is absorbed - like lungs in land creatures. ... The Fins help the fish swim. The large muscles of the body actually do most of the work, but the fins help with balance and turning.
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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. ... They use some of their fins to propel themselves through the water and others to steer the body as they swim. Fish have a system of muscles for movement.
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