Human activity And Natural

How does human activity and natural affect the ecosystem. Some of natural negative effects are when floods destroy habitats of animals and how it might ruin crops. A positive effect is that it will carry out nutrients and that it could crate a new species. Some of natural event could be bad but it could also be a good thing. A Human activity that negative is when your building over animal habitats. It also kills animals that lived and decreases food for other animals. Some good things are that when people build a park some animals will have a habitat. There are a lot of bad things come when humans start to build things where animals live. Most of the time there also a good thing that come out of it. Both human and natural affects could be bad or it could be good.