What Am I Made Of?
Most organisms consist of only one cell and are not able to be seen with your eyes alone. These organisms are only visible under a microscope and are known as unicellular organisms. Others, such as the squirrel, the cheese mold and the oak tree, are made of many cells. These common plants, animals and fungi that we can see represent only a small fraction of life on Earth. These organisms, being made of more than one cell, are known as multicellular organisms. In this lesson, you will learn how the multi-cellular organisms that inhabit our world are organized. Within a multicellular organism there is a division of labor. Division of labor means that the work of keeping the organism alive is divided among the different parts of the body. Each part has a specific job to do. And as each part does its special job, it works in harmony with all the other parts.