In conclusion, the theory that can be possible is monkey theory because scientist believed that the fist human came from monkey. The species that can be possible is Chimpanzee. Chimpanzee had many things that look like human such as instinct to survive, behavior, DNA, Body shape. However, it has something difference such as the body of monkey was very big more than human. Some scientist believed that monkey had body shape so big. That couldn’t possible to be a human. Although this theory have something didn’t match, this theory is only theory that have evidence that you can improve. However, this is just theory. That can change all the time. In the future, we will have technology that can help us to search about this. Now, this is theory be the most similar to realistic.