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www.reference.com/article/sharks-16322f82683f010

Sharks are fish, but unlike other fish, their skeletons are made of cartilage rather than bone, and instead of smooth, flat scales they have sharp, tooth-like scales called denticles. Scientists believe that sharks are 200 million years older than the oldest dinosaur, meaning they have been around f

www.reference.com/article/amazing-sharks-9eb95f7f421f6f5a

An amazing fact about sharks is that the skins of females are much thicker than that of males. This is because male sharks tend to bite the females during mating. In its lifetime, a shark can go through about 30,000 teeth.

www.reference.com/article/fun-sharks-74df813027a2ee32

Some fun shark facts include that they have no bones, they have skin like sandpaper, have extraordinary sensory skills and teeth that are constantly being replaced. Most sharks never stop swimming and some species give birth to live young, called pups.

www.reference.com/article/reproduction-important-59195fbf053d68f

Forms of life cannot survive if they do not reproduce. Different species have different means of reproducing, and different means of reproduction have different advantages and disadvantages. Asexual reproduction is the most common type.

www.reference.com/pets-animals/many-sharks-world-8638e82d84a416d1

There are approximately 470 known species of shark in the world, but it's impossible to count the exact number of individual sharks on the planet. World Wildlife Fund estimates that more than 100 million sharks are killed each year for their fins.

www.reference.com/article/sharks-located-a4ef223442d49323

Sharks live in every ocean of the world, with most species occupying waters no deeper than 7,000 feet. The Portuguese dogfish is the deepest-living shark and can be found at a depth of 12,000 feet. Some sharks, such as the bull shark, are capable of surviving in fresh water.

www.reference.com/article/great-white-shark-2f5115b25ac19f13

A great white shark, or Carcharodon carcharias, is a large shark that inhabits the coastal waters of all oceans. It is the largest macro-predatory fish on Earth.

www.reference.com/article/sharks-move-ebb093b7a38ad8f0

Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.

www.reference.com/article/sharks-fish-9831568962c46794

Sharks are fish, but they belong to the group called Chondrichthyes, or cartilaginous fish, which is a different scientific group than most types of fish. Common fish, such as tuna or salmon, all belong to the group Osteichthyes. The distinction is based upon the makeup of their skeletons.

www.reference.com/article/name-baby-shark-bd35d3e2066530c0

A baby shark is called a pup. A female shark can produce between one and 100 pups at a time, depending on the type of shark.