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the largest group of vertebrates- 25,000 species; have been on Earth 500 million years; first vertebrates to evolve
a body form that is compressed at the sides and tapered at the tail making it easy to glide through the water
feathery structures located on the sides of the head that removes oxygen from the water and allows it to enter the blood
a row of tiny holes in the skin that begins behind the gill cover and runs along the side to the tail; helps the fish feel movement in the water
all fish have scales to protect their bodies; fish can be classified according to the shape and characteristics of their scales
the location, shape and size of the mouth can be a good indicator of what the fish eats and where it lives
some fish have these "whisker-like" structures to aid in feeling and can be covered with taste buds
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