Biodiversity means having a lot of different types of plants, animals, and other living things in an area. This is important because each living thing has a special job to do, kind of like how different people have different jobs (like doctors, teachers, or firefighters). When there are a lot of different kinds of living things in an area, it's like having a big team working together to keep things healthy and in balance.
Now, some living things like plants and animals have special parts in their bodies that can be used to make medicine. Medicines are things that doctors give you to help you feel better when you're sick or hurt. But if we don't have a lot of different kinds of plants and animals, we might not have as many different types of medicine to choose from.
That's where biodiversity comes in again. If we have lots of different kinds of living things, we have lots of different options for making medicines. Scientists can study these living things and find out which parts might be good for making medicine. For example, some plants have leaves or roots that can help ease pain, while others can fight infections.
So when we protect biodiversity and make sure we have lots of different kinds of living things (like by not cutting down too many forests or polluting rivers), we're also making sure we have lots of different options for making medicines that can help keep us healthy.