In what realm did archaic humans live? Is it manussa (human) realm or tiracchāna (animal) realm? I think the interesting part is to first classify archaic humans, as a manussa or a tiracchāna?

Is there any explanation about this? Since as far as I know, Buddhism supports the theory of evolution.
There are times when humans hold long lifespan, good conducts, beautiful and large bodies, and there are times when their lifespans are short, bad, animal-like conducts, ugly small bodies. Currently it goes foward the decaying line again. Lifespan, bodies, without much taken support, is already very short and degenerated. So the age of going into relationship.

(Note that this gift of Dhamma is not dedicated for trade, exchange, stacks or entertainment but as a means to make merits toward release from this wheel)