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This web page theweirdmoleculesoflife.blogspot.com states the following, "Monday, November 10, 2008." We saw that the webpage said " Electromagnetic energy travel in waves." It also said " Wavelength- distance between 2 waves. Electromagnetic spectrum range of type of rays short to large. Pigments chemical compounds that causes color. Chloroplast allows some to pass through and others to reflect. Green reflects, causing the color of the leaves. Paper chromatography can be used to observe the different pigments in a leaf. Photosystems contain hundreds of pigment molecules, which act like light gathering panels."