推荐回答（2个）
Shark in early dinosaurs appear before three hundred million years ago on earth, has been more than four hundred million years, they in the past one hundred million years almost no change.
Around 380 species of sharks. There are about 27 species will attack humans, there are 12 likely to attack humans, there are 27 because of size and habits of the relationship, may be dangerous.
The shark's body, as small as 6 inch long, to 18 meters.
Whale sharks are the largest fish in the sea, a back up to 60 feet long
It has to constantly move forward, otherwise will suffocate.
Sharks live in the water.
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