Oxygen During the Early Development of the Atmosphere Was

question 81

Multiple Choice

Oxygen during the early development of the atmosphere was:

• A) common.
• B) rare.
• C) important for photosynthesis.
• D) about the same as now.
• E) created from the cooling of hot lava.

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Definitions:

Demographic Transition

The demographic transition is a theory describing the transition from high birth and death rates to lower birth and death rates as a country develops from a pre-industrial to an industrialized economic system.

Evidence Supports

When empirical data or factual information validates or backs up a hypothesis, claim, or theory.

Evidence Contradicts

A situation where factual information or data challenges or refutes a standing hypothesis, belief, or perception.

Urbanization

The increasing concentration of populations in urban areas, often associated with the growth of cities.