Q:

The zona pellucida:

0

The zona pellucida:


  1. is an impenetrable barrier to spennatozoa at the time of ovulation
  2. assists in the timing of the human implantation process
  3. surrounds the secondary oocyte and the corona radiata
  4. both A and B
  5. all of the above (A-C)

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B. assists in the timing of the human implantation process

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