Correct answer: D
A pollen is where male gametes are produced and so the number of chromosomes, as we are talking about gametes, is n. This means that the grain of pollen will only have a copy of each gene, and therefore only one allele for each gene - one S, and one T or t. So, the possible combinations are ST and St.
Probably a lake because it has the possibility to be the largest body of water
B muscle cells because lactic acid is what makes your muscles sore when there isn’t enough oxygen
