1. they are used by scientists for cure for disease. used by pharmaceutical and cosmetic companies to see if drugs, makeup, lotions soaps and shampoos are safe.
  2. It advances knowledge and protects humans from potentially harmful effects.
  3. Because some take it as curl and unnecessary.
  4. I think it would be soap, shampoos, some foods, and chemicals.
  5. To make sure or almost sure it okay to test on humans ans animals alike.
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