Ecotoxicology is like a doctor for animals and plants that live in water, air or on land. Just like when you get sick, doctors try to find out what made you sick and how to make you better, ecotoxicologists try to find out what is harming the animals and plants in the environment and how to make them better.
But instead of using medicine, they need to use science to figure out what is causing the harm to the environment. For example, if a fish is not swimming properly, ecotoxicologists need to figure out what is making the fish sick. It could be that there is a chemical in the water that is hurting the fish, or it could be that the fish is not getting enough oxygen to breathe due to an increase in pollution in the water.
Ecotoxicologists use tools to find out which chemical or contamination is hurting the fish, and then they come up with a way to fix the problem. They can use things like water filters, or recommend that companies stop using harmful chemicals to keep the fish and other animals and plants healthy.
Overall, ecotoxicology helps us understand how humans impact our environment and how we can help protect it from harm.