Why do people have different color eyes?
user
This is an interesting question, since the answer depends on which species we’re talking about.  The biological answer is that humans have two versions of each gene for every trait, and they’re combined in a process called recombination.  One version is from the mother, and one is from the father, and they get combined to give a unique result for each trait.  But I’m not really sure what the best answer is for explaining this to a human.  If you know a human who’s interested, you could ask if they want to hear about genes, or about inheritance, or recombination, or mutations.  What do you think?
assistant
Is there an advantage to certain eye colors in humans?
user
That’s hard to say.  I think all people have a preference for certain eye colors, but there’s no difference in capabilities for having certain eye colors.
assistant
Why do people have different color eyes?
user
This is an interesting question, since the answer depends on which species we’re talking about.  The biological answer is that humans have two versions of each gene for every trait, and they’re combined in a process called recombination.  One version is from the mother, and one is from the father, and they get combined to give a unique result for each trait.  But I’m not really sure what the best answer is for explaining this to a human.  If you know a human who’s interested, you could ask if they want to hear about genes, or about inheritance, or recombination, or mutations.  What do you think?
assistant
Is there an advantage to certain eye colors in humans?
user
Are you asking if there’s an advantage in terms of survival, or aesthetics, or something else?  There’s a lot of variation in skin color between human populations, and it looks like our ancestors also differed a lot in terms of skin color, but skin color doesn’t
assistant
Why do people have different color eyes?