How Old Are Fossils That Indicate the First Life Forms

question 38

Multiple Choice

How old are fossils that indicate the first life forms on Earth?

• A) Between 1.2 and 1.5 billion years old
• B) Between 2.6 and 2.7 billion years old
• C) Between 3.4 and 3.5 billion years old
• D) Between 4 and 4.2 billion years old

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Definitions:

Demand Curve

A visual representation that maps out the correlation between the price level of a good and how much of it consumers are willing to purchase.

Collusion

A secret or illegal cooperation or conspiracy, especially between businesses to limit competition and raise prices.

Marginal Cost

The financial outlay involved in producing a supplementary unit of a good or service.

Crude Oil

A naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials, used as a primary energy source.