Here's why:

* Diet: Sharks primarily eat meat, such as fish, seals, other sharks, and sometimes even seabirds.

* Teeth: They have sharp, pointed teeth designed for tearing flesh and gripping prey.

* Digestive System: Their digestive system is adapted for breaking down animal protein.

While some sharks might occasionally nibble on seaweed or other plant matter, this is not a significant part of their diet. Therefore, they are classified as carnivores.