Which of the following statements about the fast block to polyspermy is FALSE?

Which of the following statements about the fast block to polyspermy is FALSE?
 
  a. It occurs within seconds after fertilization.
  b. It involves a wave of electrical depolarization that spreads over the egg surface.
  c. It is not mediated by Ca2+ ions.
  d. It is more pronounced in vertebrates than in invertebrates.
  e. It is more pronounced in invertebrates than in vertebrates.

Question 2

During mating in frogs, the male clasps the female tightly around the body with his forelimbs. This is
  termed
 
  a. amplexus.
  b. fertilization.
  c. copulation.
  d. fusion.
  e. marriage.