Yellow is a primary color in subtractive color systems used in both painting or color printing!
That sounds like a versatile color. What is a subtractive color system?
A subtractive color is a model that explains the mixing of a limited set of dyes, inks, paint pigments or anything similar to create a wider range of clors. Each diffrent colo is the result of partially or completely subtracting (aka absorbing) some wavelengths of light and not others.
That sounds very intricate and involved. I was not aware that such advanced methods were used to expand our access to a range of colors.
Color***** and yup.Yellow is important in nature as well because they absorb light energy and protect plants from photodamage. 
Wow even more uses, does the color yellow interact with the chlorophyll in some plants while absorbing light energy? 
Im not sure how it works completely but im sure it interacts with cholrophyll in some way as its probably a system that works to feed and protect the plants but i do know that carotenoids give the yellow color to autumn leaves, corn, canaries, daffodils, lemons, AND egg yolks and bananas. People dont appreciate the color like they should!