Enviroment factors can influence natural selection because they can increase or decrease
a) the number of chromosomes in an individual.
b) the number of chromosomes in a population.
c)the amount of genetic variation in an individual.
d) the amount of genetic variation in population.

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.