43. How does meiosis maintain a constant number of chromosomes in the body cells of organisms that reproduce sexually?
44. Explain the relationship between early photosynthetic autotrophs and the eventual rise of aerobic life-forms.
45. On what basis can members of one kingdom be distinguished from those of another kingdom?
44. Explain the relationship between early photosynthetic autotrophs and the eventual rise of aerobic life-forms.
45. On what basis can members of one kingdom be distinguished from those of another kingdom?