On the one hand, it is true that we use them to find a cure for many deseases, and this has saved many lives and has developed science.
On the other hand, many animals suffer and we are sometimes very cruel with them. I think we shouidn't use animals for things like cosmetics or other not important things.
In summary, I think that doing experiments with animals can be very useful, but we must be careful and not mistreat them. We shouldn't use them for very important things