Biodiversity is the variety of different kinds of living things in the world. This includes plants, animals, fungi, bacteria, and other living things. We all depend on the biodiversity around us, because it helps keep our air, water and food clean and safe. For example, diversity among plants can help provide us with food, while different types of animals can help break down waste and spread pollen. As well, biodiversity can help reduce the risk of diseases, because some different kinds of living things can help stop the spread of disease. Having lots of different kinds of living things is important for keeping our world healthy!