This document provides a concept map about microorganisms. It lists examples of microorganisms like yeast, salmonella, fungus, viruses, and mould. Microorganisms can be identified as helpful or harmful to living things using a magnifying glass. Helpful microorganisms include bacteria added to boiling milk to make yogurt and bacteria that break down dead leaves. However, salmonella found in uncooked chicken and viruses that cause diseases like chickenpox are harmful. The concept map also notes that yeast is useful in making bread.