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www.reference.com/article/big-sharks-b88afc83175f69a7

The size of a shark depends on its species. The largest living shark, the whale shark, averages 31.82 feet long. The extinct megalodon was even bigger at about 60 feet long. The smallest shark is the dwarf lanternshark, which is only 6.7 inches long.

www.reference.com/article/many-types-sharks-f54f0b9d3a47bd49

More than 450 shark species have been documented as of 2014. Sharks have been around since prehistoric times, with evidence of their existence dating back hundreds of millions of years. The first sharks appeared in the world's oceans around 420 million years ago.

www.reference.com/article/sharks-found-b945655b1cc9bb16

According to the Shark Foundation, sharks are found in most of the Earth’s oceans and seas. The highest shark biodiversity occurs in the warm waters of the tropics, but many species are found in Arctic and Antarctic waters as well. Some sharks, for example bull sharks, are even capable of swimming u

www.reference.com/article/sharks-important-5ba83db27832a724

According to Shark Savers, sharks are important because of the role they play in the oceans. Sharks have a positive effect on food webs, ocean populations and habitat health.

www.reference.com/pets-animals/small-shark-called-e16cce7310b89f4c

The smallest shark in the world is known as the dwarf lantern shark. The shark is found off the northern shores of South America and rarely exceeds more than 8 inches in length.

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/fastest-shark-world-f1a29d61189ea246

Of the 400 or so shark species on the planet, the shortfin mako shark is thought to be the fastest, capable of swimming at speeds from 22 to 60 miles per hour. Makos are aggressive, however attacks on humans are rare because the species usually stays in the open ocean.

www.reference.com/pets-animals/sharks-live-86e7aa48cdea7791

Sharks are found in every ocean in the world and are sometimes found out of their habitat in rivers and streams. There are around 368 species of sharks in the world.

www.reference.com/world-view/shark-products-made-cb8496474f95dc32

Shark products are made in China. The Shark brand name, however, is owned by a company that originated in Europe and is, as of 2015, now based in the United States.

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.