When someone asked me this, my first opinion was, "it is genetic" ..
well, I was wrong. The leaves have pigments, there are chlorophyll a and b , carotenoids, and other accessory pigments. The UV light from the sun have many different waves. Chlorophyll a and b absorb the blue-violet waves and the carotenoids absorb the red-orange waves. And because the energy of the green waves cannot be absorbed, the leaves reflect the green color and that's why leaves are green!
-Ronnie Matari-
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