human vs ape

In the past, many studies showed that there is no difference between mankind and ape apart from the ability to speak. But recently, a lot of researches insist on the difference not only the ability to speak but also the type.

concept of evolution

Darwin came to understand that any population consists of individuals that are all slightly different from one another. Those individuals having a variation that gives them an advantage in staying alive long enough to successfully reproduce are the ones that pass on their traits more frequently to the next generation. Subsequently, their traits become more common and the population evolves. Darwin called this "descent with modification."