We Don't Actually Know Why Plants Are Green

We already know why all plants appear green: it's because they're full of the light-absorbing chemical known as chlorophyll. But since they appears green—bouncing back green and yellow light waves—it means it's not 100 percent efficient at absorbing all of the sun's rays. So why aren't all plants black instead? » 3/15/13 11:06am 3/15/13 11:06am