Jawaban:

1. Shark skin feels exactly like sandpaper because it is made up of tiny teeth-like structures called placoid scales, also known as dermal denticles. These scales point towards the tail and help reduce friction from surrounding water when the shark swims.

2. Sharks Must Swim Constantly, or they Die.

Some sharks must swim constantly in order to keep oxygen-rich water flowing over their gills, but others are able to pass water through their respiratory system by a pumping motion of their pharynx. This allows them to rest on the sea floor and still breathe.

3. Sharks do not care for their babies after they are born, but they do search for a safe place where they can lay their eggs or give birth.

4. Sharks are opportunistic feeders, but most sharks primarily feed on smaller fish and invertebrates. Some of the larger shark species prey on seals, sea lions, and other marine mammals.

5. There are more than 500 species of sharks swimming in the world's ocean.