40. A clam closes its shell when it is removed from its watery environment. Why does the clam behave in this way?
41. What is the difference between an electron microscope and a compound microscope?
42. How is ATP obtained from aerobic processes?
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?
46. Why are tropical rain forests so rich in biodiversity?
47. List the three terrestrial biomes that make up the United States and discuss the factors that determine their distribution.
41. What is the difference between an electron microscope and a compound microscope?
42. How is ATP obtained from aerobic processes?
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?
46. Why are tropical rain forests so rich in biodiversity?
47. List the three terrestrial biomes that make up the United States and discuss the factors that determine their distribution.