system
Given the following post, respond as if you're commenting on Reddit:
human
[The Culture] What's with all the humans?

So I'm listening to *Consider Phlebas* and it seems almost everyone except the Iridans and their companion race are some subspecies of human, but the book is listed as taking place during the earth date of 1381. Where'd all the people come from?
gpt
Humans is a broad, more understandable term for warm-blooded intelligent beings with primate ancestry. The 'humans' you speak of evolved similarly to those primates detected on this 'Earth' planet, but Culture Normal Humans are closer to Peak Human than they are to Earth Human. As you make your way through more of the Culture's history, you'll discover more Humanoid/Human species. The Culture itself was formed by several groups of Human species, each evolving separately on their own worlds.

Evolution, it turns out, is far from unique.