Microbes are really wonderful. They are everywhere! They live all around you, on you and inside you! Microbes are very small, so you can't see them. But don't worry. Some microbes make you sick, but most others keep you healthy and even help you to fight disease. There are so many different types of microbes. We still don't really know how many there are, but we know that microbes do lots of different things. Bacteria and viruses are two important types of microbes. Bacteria are really important microbes. They are small. They have only one cell Bacteria can live everywhere on earth. They are not all bad; in fact, you could not live without some bacteria! Viruses are among the smallest microbes on the earth, even smaller than bacteria. They are different from bacteria because they cannot live on their own. Viruses need to be inside a living cell to live and grow. There are not many good things about viruses – they usually attack your body and make you sick.

We understand from the passage that ……………