(Solved): Unlike humans, aquatic organisms such as sea urchins practice external fertil ...

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Unlike humans, aquatic organisms such as sea urchins practice external fertilization. Sea urchins are often used for studying the cellular basis of sex, because the structure and behavior of their gametes can be much more easily observed than those of human gametes. However, several key differences exist between animals that practice external fertilization and those, including humans, that practice internal fertilization. Which of the following statements describe sea urchin reproduction but not human reproduction? Check all that apply. Fertilization is almost immediately followed by a strong depolarization of the egg plasma membrane, preventing additional sperm from fusing with the egg. The egg is surrounded by a mineralized shell added before the egg exits the body. The egg is surrounded by a vitelline coat and a thick outer jelly layer.