After a spermatozoa penetrates an oocyte, it triggers cortical granule exocytosis. The granules release ___________ , and this allows for the influx of ___________ and this causes the formation of the ___________. Which of the following best fills in the blanks? Ca2+ , peroxide, fertilization envelope Serine proteases, H20, fertilization envelope H2O2, ZP3 , acrosomal vesicle PIP2, Ca2+, pronucleus