Thanks plankton!
Plankton are vital to the earth. There are two kinds: plant plankton and animal plankton. Plant plankton create 50% of earth’s oxygen. Just like plants on the land, they take in carbon dioxide gas and give off oxygen gas. Plant plankton and animal plankton are essential parts of the food chain. And billions of billions of ancient plankton have given their bodies to form the crude oil that powers modern society.