Which of the following ph values indicates the highest concentration of hydronium ions in a solution

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

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).

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully