QUESTION 3 Which of the following is the correct comparision of fertilization in sea urchins and mammals? Both sea urchin and mammalian embryos use membrane depolarization as a fast block to polyspermy Cleavage occurs before fertilization in sea urchins, but after fertilization in mammals Sea urchin embryos first undergo cell division about 24 hours after fertilization while mammalian embryos undergo cell division 90 minutes after fertilization O Sea urchin embryos have a jelly coat while mammalian embryos have a zona pellucida

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