There are different kinds of animals on our planet, and all of them are very important for it. For example, everybody knows that the sharks are dangerous for people, but they are useful for cleaning seawater. There are two types of animals: domestic (or pets) and wild. People keep pets in their homes. And some wild animals are very dangerous.
There are different kinds of animals on our planet, and all of them are very important for it. For example, everybody knows that the sharks are dangerous for people, but they are useful for cleaning seawater. There are two types of animals: domestic (or pets) and wild. People keep pets in their homes. And some wild animals are very dangerous.