Many plants are found in the ocean  across the world one known to most  people is seaweed. Seaweed is a plant that grows only in the oceans of the world. Seaweed  is made of algae.                                                                                                                                                           

There are other plants one is called kelp. Kelp is one of the most common plants found in the Pacific ocean. Like seaweed kelp is also made of algae. 

The actual animal that makes up the physical coral is called a polyp. It is column shaped and attaches itself to the floor of the reef. The top end extends into the water and is free to move about. Thousands of individual polyps form a colony, which in

Plankton are microscopic or really small they take a microscope to see they are eaten by whales only