If a corn plant has a genotype Sstt, what are the possible genetic combinations that could be present In a single grain of pollen produced by the plant? A. Ss, tt, St, st
B. s, tt, st, ST
C. st, st
D. st, sT, st

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.

What causes darkening of the skin as melanin production increases