system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
Why do tree leaves change their colors in autumn?
gpt
The changing colors of leaves in autumn is from the carotenoids and anthocyanin present. Chlorophyll masks the colors by turning them green during the growing season. It is then destroyed by the longer nights of autumn leaving the true colors of leaves unmasked.