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What conclusion follows from low oxygen on early Earth and higher oxygen later?

Answer and explanation

Correct answer: The atmosphere was not fixed but an evolving system

Free oxygen was very low in Earth’s early atmosphere. Its concentration increased later due to the activity of photosynthetic organisms, especially cyanobacteria. This shows that the gaseous composition of the atmosphere changed over time; therefore, it was an evolving system rather than a fixed one. Option C is incorrect because the early atmosphere was not oxygen-rich like the modern atmosphere. Exam tip: remember that atmospheric composition has changed through geological time.

Related tags

Atmospheric EvolutionEarly EarthOxygen IncreaseCyanobacteriaEarth EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeography

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