Introduction: What are Microbes and Where Can We Find Them?
Together with students, try to find out what kind of microbes they already know. There are dangerous (e.g., salmonella bacteria, etc.) as well as harmless microbes. Some microbes can cause deadly diseases, while without others life would not be possible. Even in our own bodies, numerous harmless microbes live in our intestines that help us digest food and create nutrients that our bodies need.
Activities in this lesson
Discuss what they learned.
Since microorganisms are very sensitive to nutrients and other chemicals in water, they can be good indicators of conditions in the water (pollution, quality of water, etc.). Explain what an indicator is.