Chose the correct answer form alternatives provided.

a) Fertilization is responsible for the activation/arrest of development.

b) Activation of the sperm ensures/does not ensure that sperm will meet the egg.

c) In organisms with external/internal fertilization, chemotactic mechanisms have been evolved to attract the sperm towards the egg.

d) A period of maturation in the female reproductive tract required for the transformation of sperm is known as activation/capactiation.

e) Sperm using an enzyme called acrosin/hyaluronidase penetrate their way through zona pellucida.

a) Fertilization is responsible for the activation of development because it triggers a series of cellular and molecular events that lead to the formation of a zygote, the first cell of a new individual. When the sperm fuses with the egg, the egg undergoes changes that prevent other sperm from entering and trigger the resumption of meiosis, which results in the formation of a diploid zygote with a complete set of chromosomes.

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