Nature's Palette of Colors

Colors abound around me, Green, yellow, red, blue, Purple, brown, Black, brown and several hues, And all are from nature, It’s a full palette of nature’s colors, Who wrote the codes for these colors? Why were they needed at all? We could have as well had a BW life, And lead lives like pigeons in fact, I am not a man of science, But have read it a wee bit, Somewhere we have explained, That how some colors are used in nature? But we have not catalogued far, Perhaps each color serves a purpose, A chemical,biological and survival one perhaps, I am looking for the day, When somebody someday might tell me, Why so many colors here should be.