Fish
Fish have bones and are cold-blooded. (Cold-blooded means that
their body temperature depends on the temperature of the water
around them, unlike humans, who have a normal body temperature that
stays at 98.6 degrees.) They breathe oxygen from the water through
gills on the sides of their bodies. They cannot breathe air or live
outside of water. Most fish are covered with small scales instead of
skin. Fish use fins and a tail to swim around. Baby fish hatch from
eggs. A person who studies fish is called an ichthyologist
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