Oxygen Gas (O₂) in Earth's Early Atmosphere

question 21

Multiple Choice

Oxygen gas (O₂) in Earth's early atmosphere

• A) allowed the evolution of anoxic metabolism.
• B) depleted ozone in the atmosphere.
• C) increased damage to organisms by allowing more ultraviolet light in.
• D) allowed organisms to move from the sea to land.
• E) was not toxic to most prokaryotes.

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Definitions:

Gain

An increase in the value of an investment or asset.

Donor's Adjusted Basis

The value used for tax purposes to determine the gain or loss when property is given as a gift, generally the cost basis of the donor at the time of the gift.

Fair Market Value

The price that property would sell for on the open market, between a willing buyer and a willing seller each having reasonable knowledge of all pertinent facts.

Gift

A transfer of property or assets from one individual to another without the expectation of payment or anything in return.