From the past to the present, our world has changed in many ways, not that anyone does animal that the animal is adapted to the environment, such as a fish is an animal that lives in water resources is cold-blooded, breathing with gills, and vertebrates. Can the movement with fins and muscles of the trunk. Some species are known to cover options. But some species are covered with slime-sounding or phaenkraduk. There are two hearts and jaws, except fish, shellfish, sharks.
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