During this process in Arbacia punctulata, increased respiration rates are induced by resact. Exposure of the equatorial region during this process leads to the binding of Juno and Izumo. Rheotaxis is established during this process by the expression of CatSper channels, which also mediate hyperactivation and capacitation. The release of hyalin during this process that leads to the hardening of the (*) vitelline envelope is part of the “slow block” triggered by (10[1])the extracellular release of (10[1])a calcium ion wave. During this process, enzymes released from (10[1])the acrosome digest the (10[1])zona pellucida. Intracytoplasmic sperm injection allows this process to be done in vitro. For 10 points, a zygote is formed during what process, the fusion of a sperm and egg cell? ■END■