|   2087 - from Neneka (USA) - 2009-09-20
Shark : "Shark History"
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Sharks are over 400 million years old. This ancient predators are such good survivors they need little change. Sharks are is a kind of fish known as Chondrichthyes, or cartilaginous fish. That means they do not have bone but cartilage. Cartilage is strong,flexy, and fibrous substance. Much softer than bone. Our ears and nose is made out of cartilage. Their class is known as Elasmodranchii, that includes ray and skates.
Shark are considered the greats preditors of the world. My favorite sharks are the great white, shart fin mako, and thresher shark. |
