Review Questions: 1) Why is fertilization envelope formation considered to be a reliable indicator of egg activation (or fertilization)? What other assays can be used for successful fertilization? Describe it. the pertilization envelofe quts as a barmer plevent the perpiliqatir of tre egg by none tarn one sperm eell 2) Once the fertilization envelope is raised, do sperm continue to be attracted to the egg? Explain why or why not? 3) Do the sperm bounce off the fertilization envelope or stick to it? Why or why not? 4)Describe the molecular and biochemical processes behind fertilization envelope formation in sea urchins..