Mice and rats are used in animal testing for different reasons, one of them is medical testing. scientist will test different new treatments and drugs on rats and mice, because of their great intelligence and similarities in how they react to drugs, just like humans do. they're used to test different physiological methods also, where the rats and mice will be put to the test, the reason for this is to see how they react and to see if the procedure is safe for human use. households products such as cleansers, cosmetics, petsides are all tested on mice and rats, to see if they're safe for human use. depending on the outcome of the results of testing, will depend on whether the products is safe for human use. up to 100 million mice and rats will die because of the high risk of the testing. the rats that are tested on are not treat the best, alot of them will die painful deaths and suffer severe injury, physiological problems and risk of disease. the welfare of the animals are effected severely, this is because of the harmful substances that are used are either meant to harm the animal or be safe. the only use for the rat is to either suffer or not suffer, they're there just to be tested on, most will die because of exposure to harmful substances. the rats will be crammed in small places, with hundreds of other rats, and the feeding will not be monitored. this means the rats will not get the right amount of food and water that is needed, also they will have a high risk of disease and illness