Rats, for example, produce their own vitamin C where humans must supplement it through food. Mice breathe through their noses, their protein needs are higher than those of humans, their heart rates and blood coating factors differ markedly from humans (Newkirk 215). Small progress has been made in the treatment of the main diseases affecting humans. People continue to die and animals continue to suffer! Given the reliability of the animal studies in question, scientists should look for non-animal alternatives. Scientists who regularly use animals in their research argue that medical innovations would grind to a halt. I agree that changes would need to be made and this change would not happen overnight, but I am sure that alternatives are possible and represent the right choice. Some argue that eliminating animal studies would also eliminate a controlled environment, but they fail to consider the possibility of experimenting with human tissue in vitro or in test tubes, and how this would be a solution to this problem. Human cells can be easily obtained or collected from surgery, biopsies, or autopsies, and thanks to technology, many of these cells or tissues can be preserved indefinitely (Greco 101-102). Another less invasive option would be through autopsies. Autopsies exclude moral implications because they would be performed to gain people's medical knowledge