ATP is converted into ADP when energy is needed by an organism. If water were not available in the mitochondria what would mostly likely happened?

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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).

nucleus

would be most reasonable answer tbh