Sharks
Fossils show that the first fish that can be identified as sharks lived about 300 million years ago.They are among the most ancient of Earth's advanced animals.There are more than 300 living species. the majority of them live in temperate and tropical regions. Sharks have skeletons that are made of cartilage instead of bone.Cartilage is an elastic tissue that is created before the formation of bone begins. Most sharks have torpedo-shaped bodies that taper towards the end. This helps them to swim fast. The sharks that live at the bottom of the water tend to be stout and heavy.
The largest shark is the whale shark,which reaches a maximum size of about 15 meters in length and nearly 20 tons in weight. The smallest shark the dwarf lantern shark,which is only 19 centineters. Sharks have a pointed snout that extends forward over a crecent-shaped mouth. The mouth is set with sharp triangular teeth. Sharks grow teeth throughout their lives to replace the lost and broken ones and to keep up with their physical growth.Sharks have a very sharp sense of smell.They are sensitive to light and can detect objects even in murky water
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Summary ^o^ : This article is about sharks that have many species(300 species) .the species of largest shark is the whale shark . On the contrary, the smalles shark is The dwarf lantern shark. The most of sharks live in temperate and tropical. Sharks are known for their speed and movement skills in the water,inclued skills in smell and sensitive to light
Response ^__^ : In my opinion, I think of the sharks is dread animal and it has only species. But when I read this article, I know that it hasn't one species but there are most than 300 types and the most live in temperate. I feel wonderful with skills sharks such as speed and movement in the water , sharp sense of smell and more. The present life,I hope that I will not meet sharks.
By.. Miss Chinnada Assanuk ID. 1500101074 No. 13 Sec.6911
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