The Theory of evolution is not a sufficient explanation for the origin of life, or of the human species.
Once you have life evolution takes place. We know that from the fossil record and from observing the small evolutionary changes that take place constantly, especially in simple organisms.
The structural features of the human species are very similar to primates. DNA testing confirms this relationship. Most of our DNA is very similar to Chimpanzee DNA. The most economical explanation is that the human species evolved from extinct hominids that diverged from the other primates a few million years ago.
The origin of consciousness, because it isn't understood, is the real mystery here. No other animal has anything like it.