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There are about 350 species of sharks. The largest sharks are
the whale shark and the basking shark, which feed on plankton and small fish.
The adult whale shark grows to about 13 meters long, while the basking shark
extends a little over 8 meters. (46) On the other hand, there
are a number of them which have attacked and killed swimmers. These sharks
include the great hammerhead, blue, whitetip, and, of course, the great white
shark. (47) The great white grows to between
5 and 8 meters long and can weigh more than 1300 kilograms. It can swim through
the eater at speeds reaching 32 kilometers per hour. However, one of the fastest
swimmers in the shark family is the blue shark, which can swim at a speed of
nearly 752 kilometers per hour. (48) They
can grow as long as 5 centimeters, and they are very sharp. Unlike humans, who
have two sets of teeth in their life time, some sharks can have as many as 5 or
6 sets. It is rare for a shark to have fewer than 4 sets. It is rare for a shark
to have fewer than 4 sets. As the shark’s teeth are worn out, they fall out and
are replaced by the next row. (49) In a
lifetime some sharks can grow and lose between 10,000 and 30,000
teeth. Sea biologists have discovered that the shark has a
remarkably large brain and a well-developed sensory system. The animal has an
extraordinary sense of smell and excellent vision.
(50) Special sensory pits on the shark’s nose and chin can
detect weak electrical fields in the water that are produced by fish and other
animals. Scientists have concluded that sharks associate food with electrical
fields. Scientists also believe that sharks create their own electrical fields
to aim them in knowing where to go in the sea. A. Must of
the species are not particularly cruel. B. Sharks have
lived on earth for more than 180 million years. C. The
great white is the largest and cruelest of all animals known to attack
humans. D. Some sharks can wear out a full set of teeth
in less than 6 months. E. One of the most unusual aspects
of the shark is its teeth. F. But sharks are also
sensitive to electrical fields.