Ocean

Oceans are the largest echo system of all. Oceans have many habitats. 75% of the earth is covered with water. Sunlite can go down about 100 meters of water. Lot of plankten live there. Planken is microsofic. There is a lot of presher down very far from the earth surface. Different animals live in different parts of the ocean. There are more than 21,000 different speshes in the ocean.