Most cells in the body are diploids, germ line diploid cells will undergo meiosis to produce gametes. Fertilization following, the gametophyte phase is haploid and the part of the life cycle in which gametes are produced by mitosis of haploid cells.
D. Endoskeletons are inside, like our bones, and get bigger as we grow. Exoskeletons don't, which is why they have to shed and regrow a new one when they grow.
