#9. Which mechanism prevents an ovum from being fertilized by multiple sperm cells?Select one:

a. Once a sperm penetrates the jelly-like coating of the egg, no other sperm cells can penetrate the coating.

b. When more than a single sperm cell fuses with the plasma membrane, multiple zygotes can form, leading to the conception of twins or triplets.

c. When a sperm fuses with the plasma membrane of the egg, depolarization of the membrane occurs.

d. The egg can only survive in the Fallopian tube for 24 hours as it does not have mitochondria to produce energy.