The most abundant element in the atmosphere can also be found in ?

Which is an example of a population?

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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.