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 In a newly fertilized egg, the vitelline layer     
A) reduces the loss of water from the egg and prevents desiccation.
B) opens the egg's nuclear membrane to allow haploid sperm DNA to enter.
C) hardens to form a protective cover.
D) secretes hormones that enhance steroidogenesis by the ovary.
E) provides most of the nutrients used by the zygote.
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