A Reproductive Difference Between Sea Urchins and Humans Is

question 20

Multiple Choice

A reproductive difference between sea urchins and humans is

• A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization.
• B) sea urchin eggs are produced by meiosis, but human eggs are produced by mitosis.
• C) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm.
• D) sea urchins, but not humans, have a need to block polyspermy because only in sea urchins can there be more than one source of sperm to fertilize the eggs.
• E) sea urchin zygotes get their mitochondria from the sperm but human zygotes get their mitochondria from the egg.

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Definitions:

Nonexclusive

A term usually related to goods or services, indicating that they cannot be withheld from individuals who don't pay for them.

Marginal Social Cost

The total cost to society, including both private and external costs, of producing one additional unit of a good or service.

Common Property Resource

A type of resource for which ownership or access rights are shared among individuals or a community, leading to potential issues of overuse or depletion without effective management.

Lighthouse

A tower equipped with a powerful light used to guide or warn ships at sea.