system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If fruits are produced by plants for animals to eat and spread seeds around then why are lemons so sour?
gpt
A lemon is not a naturally occurring fruit, it's actually bred from a sour orange and a citron, the sour orange itself being bred from a pomelo and mandarin. So it's not the product of evolution, but selective breeding.