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The Detailed Description of Shark

Few lovers of marine landscapes beauty would freely swim in the open sea, admiring its magnitude and vastness, without fear of meeting a shark – the Empress of the sea waters. A shark is an ideal predator created the perfect by nature millions of years ago.

Sharks are widely spread in seas and oceans and are found even in fresh water. They live both in coastal shallow waters and in the open ocean at great depths. At present, there are over 450 species of sharks, ranging in size from 20-30 cm up to 20 m.

The characteristics features of the shark structure are the presence of a skeleton composed entirely of cartilage, pectoral fins that are not connected with the head, and five or seven gill openings. The skin of a shark is covered with strong rhombic shaped scales.

The teeth of most sharks are in the form of sharp cones which are regularly replaced in case of loss or when worn-and-torn. Depending on diet and lifestyle teeth and jaws are very different in various species of sharks. Some teeth are small and smooth; others are sharp and cultrated for tearing meat of a big prey. The upper jaw of a shark is made of the hinge suspensory that allows wide opening of the mouth.

Sharks have no swimming bladder, instead, to compensate negative buoyancy they use, a cartilaginous skeleton, fins and a huge liver.

One of the major sensory systems of a shark is a sense of smell. So-called nostrils are bags on the face, overlooking the water to the olfactory receptors. Sharks need a sense of smell to find prey and for reproduction.

Thanks to the tapetum lucidum – the reflective layer behind the retina, sharks have very keen eyesight. Some sharks have a blinking eyelid that they close when they attack. Sharks without eyelids just roll their eyes to avoid damage. Sharks perfectly distinguish the contours and contrasts of the object, but their eyes do not transmit the colour range.

Sharks need fins to move and stabilise the body. The fins can be paired and unpaired in number, and according to the location on the body – thoracic, dorsal, pelvic, anal and caudal. Front and rear fins act as stabilisers. A caudal fin is shark’s basic engine with the help of which it builds up great speed. The shark also uses its tail as a weapon for stunning fish. Pectoral fins are located behind the gill openings and function as a rudder.

In general, the body of the shark was so well honed by evolution that it has survived in the long struggle for existence, with different, often very powerful predators, with little changes in the structure.

Few lovers of marine landscapes beauty would freely swim in the open sea, admiring its magnitude and vastness, without fear of meeting a shark – the Empress of the sea waters. A shark is an ideal predator created the perfect by nature millions of years ago.

Sharks are widely spread in seas and oceans and are found even in fresh water.

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Assignment ID
100001186
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CREATED ON
August 26, 2016
COMPLETED ON
August 27, 2016
Price
$37
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Christ25
December 8, 2016
Christ25
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December 3, 2016
Christ25
5/5 Excellent work!!
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December 1, 2016
Christ25
Thank you so much! You helped me lot :) 5/5