A sea urchin egg is treated with an inhibitor that prevents the rise in intracellular Ca2+ right before fertilization. Which of the follov events would be blocked by addition of this inhibitor? Choose one or more: O A. entry of multiple sperm into the cell O B. fertilization envelope rising from the cell surface O C. formation of vesicles under the plasma membrane O D. exocytosis of hydrolytic enzymes

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