Since the only way to directly mimic the human body is to use it itself, scientists were forced to find the closest and best alternative. ... Dogs have a cardiovascular and respiratory system similar to that of a human. Cats have a neurological system similar to ours, while non-human primates have several features that are similar to a human's such as the number and size of their teeth.(5) Although each of these animals benefits the Science world due to their similarities to us, they are not used nearly as often as mice and rats. ... Scientists are learning how the Human Immunodeficiency ...

• Word Count: 3643
• Approx Pages: 15
• Has Bibliography