In biological systems, what would be an example of a decomposition reaction? a)when sodium and chloride combine to make sodium chloride b)when starch is broken down into sugars c)when hydrogen and oxygen combine to make water

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.