Scientific testing on animals

Some persons think that to prove medicaments or chemical substances in animals is bad. I think that this that the scientists do is very nice since it helps to find priests for diseases and this way it would not be necessary to prove the above mentioned medicine or substance in a person. If the above mentioned substances were proved in a person it would be a problem since if it does not react well it would cause the death and would not be a problem so big as in an animal. Nevertheless on one hand it is bad that they prove these substances in animals since also they are alive beings. In conclusion, it seems to me to be brilliant that the science scientific tests in animals and not in persons and with this encontraran solution to the diseases that even do not have them.