According to the presence of some common features human beings and monkeys belong to one big class of primates. They are characterized by different common peculiarities. Some of them have more developed teeth and hands, while other representatives have a bigger brain. However, it is impossible to say that some primates are more evolved than others. In the process of evolution they took their arboreal niche, starting to develop peculiarities, which they needed to survive. For example, life on trees developed long arms and a good reaction. Constant stream of decisions, which was needed to survive developed the human brain. For this reason each representative of this class is different and evolved in its way.