<|im_start|>user
Why are plant leaves green?<|im_end|>
<|im_start|>assistant
Typically, plant leaves are green as they contain chlorophyll, which is a natural compound that helps the plant to absorb energy from light. 

However, leaves are not always green - some plants naturally have pink or orange leaves, and most plants also change leaf colors according to the seasons.<|im_end|>
