Normally, only one sperm fertilizes an egg. What role do other sperm play?

Normally, only one sperm fertilizes an egg. What role do other sperm play?
  A. They assist the fertilizing sperm in penetrating the egg.
  B. They trigger chemical changes in the egg.
  C. They dissolve the outer barriers surrounding the oocyte.
  D. They assist the fertilizing sperm in penetrating the egg and trigger chemical changes in the
  egg.
  E. They trigger chemical changes in the egg and dissolve the outer barriers surrounding the
  oocyte.

Question 2

Sex-influenced traits are
  A. carried on the X chromosome and subject to dosage compensation.
  B. expressed more in males than in females.
  C. expressed in relation to hormone levels in males and females.
  D. expressed only in one sex.
  E. always expressed traits.