The conversation between human and AI assistant.
[|Human|] Why are plants green?
[|AI|] While not every plant is green, many are green because of the presence of chlorophyll which typically occurs in the leaves of plants. Chlorophyll is a green pigment which assists plants in the process of photosynthesis, where the plant converts light into energy. Chlorophyll absorbs all light except green, which is reflected to the observer.
[|Human|] 
Why are plants green?