element -
Where humanity came from is no different that the rest of the evolutionary process.
As for where we came from, most of it is no longer a mystery to us, there are small gaps, and we aren't sure where some branches in our tree connect, but our history, in short, is this :
65 million years - Dinos die out. Mammals become the big cheese. Lots of species evolve to fill all the niches left by the dead dinos. Among these new mammals are Primates.
20 million years later, there are now anthropoids which later give rise to Monkeys and Hominoids (apes and humans).
Around 20 million years ago, the group that later will include apes and humans begin to diverge from other primates.
10 million years ago Orangutans begin to follow their own evolutionary path, seperate from other Apes and Humans.
6 million years ago, each Ape family- Gorilla, Human, and Chimp begin to evolve seperately.
So, 6 million years ago, there was a *common ancestor* of all three of these groups of animals. It wasn't a chimp, gorilla, bonobo, or human. The species that were alive then happen not to be alive now. They gave rise to the surviving species we see now.
To say that we evolved from chimps is just as incorrect as saying chimps evolved from us.
The reason why there are still animals like lemurs and monkeys around now is the same reason why your father and grandfather could be around now. Are you "better" than your father? Probably not, but you are different. And that's all evolution is... we arent better than a chimp or a dragonfly, we're just different.
And don't forget, life is billions of years old apes didn't arise out of the primordial soup, nucleuos-less single celled organisms did.