Some people think that is important to use animals in scientific test because it can help to save people. For example there are a lot of laboratories that use rats to experiment with them because they are looking for a cure for cancer. If they find it, they will have a great succeed and everybody will get benefits.
On the other hand, some people think that use animals in scientific test is an abuse and they suffer the consequence.
From my point of view, I think is important to test with animals because is a way to find cure for diseases.