Evolution Of Sharks
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Evolution Of Sharks

Sharks were first found on earth over 450 million years ago. Majority of the early sharks were reasonably small. A lot of evidence suggests that they looked more like small fish when they first originated. Many among them were found to have great resemblance with eel.


An important point to remember about sharks is that they do not have a structured brain. But, they evolved to have an excellent ability to smell and are known as one of the most intelligent species under the oceans. Sharks have many other characteristic features that have evolved with time.

Sharks used to have smooth teeth. In early times, sharks used to depend upon plants for their food. Something would have been occurred later, which affected the growth of plants and made sharks to consume living creatures in water. Sharks have a skeleton both inside and outside, which provides remarkable protection and movement to its body. They breathe with the help of a slit present in their gill. The diverse species were capable to familiarize themselves to fresh and salt water environments and also able to survive in a diversity of unlike temperatures.

There are 3 universal categories of sharks that eventually evolved. These categories have been formed according to the structure and function of their body. The categories are:

The territory of sharks is not only in various levels of the ocean, but is also extended to different geographical regions.

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Facts-About-Sharks      Sharks are among the most amazing animals and also have the reputation of being fiercest than all other sea animals. Sharks are in the Chordata phylum and Vertebrata subphylum. They belong to the category of the cartilaginous fish. There are more than four hundred species of sharks that are known to exist across all the oceans on the planet. More..