Some day, you may need surgery at a hospital. Imagine, that nobody has ever gotten surgery,and you are the first experiment. Would you accept to be tested on or would you rather wait for someone to go before you? If you have ever dissected a frog, then maybe you would know what to choose. Surgeons would imagine you as a frog, and they would try to experiment on you. 
      That is why the scientists and surgeons study on lab rats and other animals, before they can try the effects on an actual human body. Before, you can get near any type of chemicals and things they use to test on the rats, you have to pass as a testing subject. You can't possibly be a testing subject, if you're a human, you have to wait till after it is testing on the mice and rats that are up for experimenting. 



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Briana's Wonderful Experience at Computech