The Greatest Mass Extinction of All Time Occurred at the End

question 28

Multiple Choice

The greatest mass extinction of all time occurred at the end of the ____ era, in which more than 90% of all existing marine organisms became extinct.

• A) Archaean
• B) Paleozoic
• C) Cenozoic
• D) Mesozoic
• E) Proterozoic

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Definitions:

Population

The sum of individuals living in a specific region or nation.

Total Fertility Rate

The typical amount of children a woman is expected to have throughout her life, based on present fertility rates.

Replacement Rate

The ratio of a retiree's pension benefit to their earning before retirement, often used to measure the adequacy of retirement income.

Present Value

The current worth of a future sum of money or stream of cash flows given a specified rate of return.