system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren’t all trees evergreen?

What makes an evergreen tree stay green all year round vs a tree that dies? Why can’t all trees do this?
gpt
Takes energy to make the durable leaves. So the trees keep them. You can drop your leaves and forget about having to spend energy to keep them. If you want some cool easy information about trees, The Common Descent Podcast has an episode on trees.