correlation between photosynthesis and the greenness

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In the winter in the Midwest, everything looks dead, but it's really not. The trees and plants merely go dormant. Here's what happens, as the days gets shorter plants recognize the change in light. They stop making chlorophyll which makes the leaves of trees look yellow and orange. Those colors are caused by pigments that are called carotenoids which are in the leaves all the time, but not very ...