Which of these is a primary reason that good air quality should be maintained? O A. The composition of air is fairly constant.
B. Pollutants prevent heating of the air.
C. Pollutants can cause a decrease in air pressure.
D. Gases from thelimir are important for living organisms.

what is the answer

Explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

cell division is not regulated in tumor cells.