The graph describes the change in egg membrane potential associated with fertilization in the sea urchin. What event occurs within 20 seconds of sperm addition? mv 100 50 0 -50 -100 4 Sperm added 0 20 40 Seconds 60 a. acrosome reaction O b. sperm binding to the egg plasma membrane Oc. Influx of Na+ from the seawater O d. all of the above 80

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