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Low early oxygen and later oxygen rise support which major idea?

Answer and explanation

Correct answer: Atmosphere evolved over time

The amount of oxygen in Earth's atmosphere was not constant throughout geological history. The early atmosphere contained little or no free oxygen compared with today. Later, oxygen increased substantially, especially after photosynthetic organisms released oxygen over long periods. This change shows that the atmosphere developed and changed through stages. Therefore, option A, “Atmosphere evolved over time,” is correct.

The question contrasts an early oxygen-poor atmosphere with a later oxygen-rich condition. That contrast itself proves that atmospheric composition changed. An atmosphere that never changed, or one that was always rich in oxygen, cannot explain this sequence. Oxygen was not confined only to Earth's core; it became important in the atmosphere after biological and geological processes altered its composition. Thus, the evidence supports atmospheric evolution rather than a fixed atmospheric state.

Related tags

OxygenAtmospheric EvolutionStages

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