18. primary sex characteristics have to do with
a. qualities such as beard growth in males.
b. qualities such as breast development in females.
c. the growth and function of the reproductive organs themselves.
d. "masculine" and "feminine" body features.

C. Secondary sex characteristics include; increased fat deposits in *Breasts, thighs, & butt for females.* & *Penis & butt for males* and more.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.