Respuesta :
Consider that the rock outcrops at the surface of the land in your neighborhood are Permian. You may find fossils of the first reptiles or jawed fishes below.
Jawfish include cartilage and bony fish. cartilaginous fish. Cartilaginous fish include sharks, rays and rays. Cartilaginous fish have skeletons made of cartilage, a lighter and more flexible material than bone. Fish of this species usually have mobile jaws armed with well-developed teeth.
Not only humans, but all other living jawed vertebrates such as sharks, reptiles and mammals are all descendants of the first jawed fish. Today, we see a distinct pattern in this area, with new teeth developing behind old teeth and under the human jawbone.
There are two types of living jawed fish: cartilaginous fish (cartilaginous fish or elasmobranch fish) and osteophyte (bony fish). Both classes of fish have two pairs of fins and a finned tail for propulsion in the water.
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