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Sharks are reputed to be able to detect minute amounts of blood in water, and to be able to follow blood trails for miles. In fact, although sharks can detect blood at concentrations of as little as a few parts per billion, a very considerable quantity must be spilt before it is detectable amongst billions of gallons of seawater. Sharks actually use sounds and vibrations to locate most of their prey.

Sharks are reputed to be able to detect minute amounts of blood in water, and to be able to follow blood trails for miles. In fact, although sharks can detect blood at concentrations of as little as a few parts per billion, a very considerable quantity must be spilt before it is detectable amongst billions of gallons of seawater. Sharks actually use sounds and vibrations to locate most of their prey.

==Classification==

==Descent==

Sharks likely belong to the [[holobaramin]] that includes skates and rays. There is no need to discuss post-diluvian spread, as sharks can are not terrestrial.

Sharks had evolved into forms that are reasonably easily classified as "sharks" over 450 million years ago. 300 to 150 million years ago, sharks had evolved into two reasonably distinct groups. "Modern" sharks appeared relatively recently, about 100 million years ago. One of the most impressive ancient sharks was the massive megalodon.

 

According to [[Young Earth Creationism]], sharks likely belong to the [[holobaramin]] that includes skates and rays. This holobaramin was allegedly created on the sixth day of Creation, ''ex nihilo''. Post-diluvian dispersal is not necessary, as sharks are not terrestrial.

==References==

==References==