How many countries have coronavirus spread?

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.

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement

Which label correctly identifies what x represents in the concept map?