<|im_start|>user
Why are plants green?<|im_end|>
<|im_start|>assistant
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.<|im_end|>
