system
Given the following post, respond as if you're commenting on Reddit:
human
At what point along their evolutionary chain is an organism considered to be a new species?

If you trace back the genetic lineage of human ancestors, how far back could you go and still have an organism that is homo sapiens? What is the "dividing line" and how is it scientifically defined?
gpt
It's like asking where one color on the spectrum ends and another begins, or where one ocean ends and another begins, or where space ends and the atmosphere begins.  Even when there are clearly two categories, there's not always a specifically identifiable point where they transition.  You can put in an arbitrary one, but it's still pretty arbitrary.