One Likely Reason That Only Microbes Existed for the First

question 20

Multiple Choice

One likely reason that only microbes existed for the first approximately 2.5 billion years of life on Earth is that the concentration of _______ was too low to support more complex life.

• A) carbon dioxide
• B) oxygen
• C) nitrogen
• D) water vapor
• E) sulfur dioxide

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Definitions:

Measured

Quantified or assessed in terms of quantity, degree, or size.

GDP

Gross Domestic Product refers to the aggregate value of all products and services generated inside a nation's boundaries over a defined time frame.

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Time spent away from business, work, job hunting, domestic chores, and education, as well as necessary activities such as eating and sleeping.