Some are good, some are bad. Some bacteria are good and help to kill germs in our bodies. I'm not too sure whether yeast is a bacteria or fungi but it helps to make bread. Yogurt helps too turn milk to cheese and yogurt is made of good bacteria.
Why Are Unicellular Organisms Important In Our Everyday Lives?
Because it's the people around us, our moms, dads, sisters, brothers, teachers friends. It's important because they are who we interact with so we aren't lonely :)