It turns out that tiny living things are all over our body. In fact, you have 100 trillion of them on and inside of you right now, and they’re really important to keeping you alive! This leads to the question we’re going to answer in this unit:
How can having 100 trillion microorganisms on and in the human body keep us healthy?
It may seem weird and unbelievable that you have tiny living things on and in your body! Before we explore them, let’s make sure we have a few key vocabulary words under our belts:
