In this topic you will learn about how all living things depend on other living things to meet their needs for survival.
Organisms depend on one another to meet their needs.
An ecosystem with fish and plants shows how organisms depend on each other. The plant gives off oxygen for the fish to use. The fish gives off carbon dioxide for the plant to use. The fish and the plant take part in the carbon dioxide and oxygen cycle. The carbon dioxide and oxygen cycle is the process of trading or exchanging the gases oxygen and carbon dioxide between producers and consumers.