system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we have earlobes?

Evolutionarily speaking, why has the human race developed earlobes? Are earlobes present in other animals?
gpt
Wikipedia doesn't know what they're for, usually random traits like this are caused by either:

1) The genes that cause it to grow also have other functions (maybe brain development?) that are selected for

2) Sexual selection - earlobes (for some reason) make a person look better to the opposite sex so you have more mates, like a miniature version of a peacock tail.

3) Random luck - a mutation caused them and it stuck because they don't do any harm.

Also apparently chimps have earlobes too so they must have developed before humans split from other great apes.