Human evolution or hominization is a fascinating journey through millions of years.The present humans are all consequence of evolution, which is the process of transformation of species through changes in produced in successive generations.We belong to the vertebrate group, to the class of the mammals, to the order of the primates, to the species Homo and the genus Homo sapiens. But the evolution of each species was different. We all probably came of a common trunk that, far behind, 70 million years ago, in the period called Paleocene, began to divide.The first hominoids.