
Today i'm going to speak about fish.
Fish are vertebrates, aquatic, typically ectothermic, which have a fusiform body, the members turned into flippers or fins (absent in more basal groups) supported by cartilaginous or bony rays, gills or gills that breathe oxygen dissolved in water (although the use lungfish lungs) and for the most part, the body covered with scales.The breath of fish is quite different from human. They breathe causing water to pass through the mouth and then up to the gills (gills), where oxygen is removed from the water.Fish have a vision of short, though fantastically blind in all directions. They can not hear very well, but have sensitive parts of the body that allow them to realize what is happening nearby. The blood of the fish, unlike ours, is cold.