Sharks generally live in the ocean.

Sharks are sensitive to water temperatures, and they become inactive when water temperatures fall below 20 degrees Celsius. Sharks are generally found in the tropical and temperate oceans of the earth, and the only sharks that live in frigid waters are individual species such as the Greenland shark. Not all sharks live in the sea, there are some species of sharks that live in fresh water, such as the aggressive bull shark.

Sharks mostly feed on marine animals such as fish. Sharks feed on injured marine mammals, fish and carrion, culling out the weaker members of the animal.

Expanded Information:

1. Sharks are a creature of the sea, and at the same time are in a dominant position in the chain of marine life. Sharks have a long history on earth, about 300 million years before the emergence of dinosaurs have existed on earth, so far there have been more than 500 million years of history.

2. Shark embryos can sense danger approaching:

Shark embryos can also sense potential dangers in the neighborhood, and for sharks, they are most at risk when they are in their egg sacs. As the shark embryo grows, the oocyst seal begins to open, and predators can detect the developing baby shark through an electric field. When a predator approaches the oocyst, the shark embryo is able to sense the approaching danger and will close the mouth of the oocyst, or even stop breathing, to avoid being detected by the predator.

Baidu Encyclopedia-Sharks