What is the function of phytochromes? A. chemicals used to sense darkness
B. accessory pigments that help in photosynthesis
C. pigments that absorb light energy from the sun and to help change it into chemical energy
D. hormones produced in the stem tip that promotes cell elongation

the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation:

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.