We have used animals in research for as long as scientist have been doing experiments. We have learned many useful things from these experiments for example,Pavlov's training of dogs helped us understand about learning. University researchers might work to find a cure for patients suffering from a disease.
Or employees of a cosmetic company may test new make up. Both use animals to help with theb research. Scientist often have contracts with a company to supply animals for research. These animals can suffer and even die.