Sharks' ecosystems are quite varied. Some sharks live in fresh water while others live in salt water. Sharks can be found in tropical waters around the world, as well as icy waters. Sharks live in all depths of water.
Most sharks eat the same things. Some of these are fish, squid, and octopuses. Some are so small they have to eat plankton, while others eat other sharks, including their own babies. Big sharks will eat anything, even trash. Once a suit of armor was found in a Great White Shark! Sharks do not normally eat people. Shark attacks rarely ever happen.