They found that no matter how large or small the organism was, it was made of cells. ... Larger organisms, like people, are made of billions of cells. ... Each organ in each system depends on other organs for the body to function properly. For example, to perform the job of digesting food, the digestive system needs the mouth, teeth, tongue, throat, stomach, intestines, and glands. ...

• Word Count: 1272
• Approx Pages: 5
• Grade Level: High School