Did you ever think your body is like a rain forest or a coral reef?
For many microscopic critters, you are a walking ecosystem. These organisms need each other. And they live in the same environment—you!
So many bacteria live on your body. They outnumber human cells by at least a hundred to one! They are about 10 percent of your body weight. You can wash away many bacteria. But they reproduce very quickly, doubling as fast as every 20 minutes. The bacteria population on your body can bounce back within hours.
