An angiosperm species is evolving to become insect-pollinated instead of wind-pollinated. what genes are likely to become upregulated? (select all that apply.)
a. genes that increase petal size.
b. genes that increase nectar deposits.
c. genes that increase stigma size.
d. genes that produce odorants

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.