Great white sharks

Trimis la data: 2015-10-01
Materia: Biologie
Nivel: Liceu
Pagini: 3
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Autor: Ana_I
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The official name for the Great White Shark is Carcharodon carcharias. It is in kingdom-animalia, phylum-chordata, subphylum-vertebrata, order-lamniformes, family-lamnidae. The Great White Shark's body can grow from 4 ft to 23 ft. The female shark tends to be larger than the male. Its skeleton is all cartilage and 63% of the body is muscle. These sharks are known for predatory behavior, and can have as many as 20 rows of sharp teeth. Only a few species, including the White, the Mako, and the Tiger shark, have the large fearsome teeth popularly thought of as the typical sharks. The Great White Shark' can reach speeds of up to 30 MPH.

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Sharks are sensitive to light and can detect objects even in murky water. Some sharks have a mirror like layer under the retina that allows more light into the eye. Sharks do have ears, but the role of hearing in the shark's location of prey is not well understood yet. Sharks have a lateral line, or lateralis system, which helps them detect sound waves and disturbances in the water. This system consists of a series of thin canals, filled with water that runs along the side of the body. The canals are attached to nerves that send signals to the brain.

Sharks can also sense electricity and magnetic fields. Sensory pores located on the shark's head can detect prey's bioelectric field even if the prey is buried in sand. A shark can also detect the earth's magnetic field. Open-ocean sharks may use this information to navigate and orient themselves.

The great white shark roams in many of the world's seas and oceans. It does however spend most of its time in shallow coastal areas where there is plenty of prey. The great white is found mainly off the coasts of North America, southern Africa, Australia, New Zealand, Japan, and parts of the Mediterranean. Typically the great white avoids very warm or cold seas, and is most comfortable in water about 50-70 degrees F. It has however been known to wander as far north as Alaska.

Sharks unlike most fish must always keep swimming in order to breath. If they stop, they will sink to the bottom and drown. This is because they do not have a swim bladder, which is a small air fill organ. They must keep the water moving across their gills to get oxygen at all times to breathe.
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