system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why does human species look more or less the same, even among different races, while there are so much varieties in other animal species?
gpt
There is a theory that visual diversity is so low because at one point during human evolutionary history the population was reduced to 2% of what it was. This would drastically have reduced the visual variety, regardless of the population rebuilding.