How dose water get below the surface to become groundwater

What causes the phospholipids to organize themselves the way they do

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.