Clownfish

Clownfish

If you were a marine biologist, you would learn about sea organisms. You might study the way clownfish and sea anemones help keep each other alive.

Clownfish are small and defenseless. Even when they are fully grown, they are only about 13cm(5inch) long. 
If a clown fish swims around in a reef, it is in great danger of being eaten by a large fish or another organism. It needs a safe place to hide.

Anemones look like flowers, but they are actually kind of a animal called a polyp. A polyp has a soft, simple body shaped like a bag that is open at one end, with tentacles areound the opening.