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Which statement explains Earth's evolution most systemically?

Answer and explanation

Correct answer: Internal differentiation outer atmosphere hydrosphere and biosphere were sequentially connected

The direct answer is A. A systemic explanation sees Earth as a connected system rather than a collection of unrelated events. First, internal differentiation separated materials and helped form major internal layers. Then the outer environment, atmosphere and hydrosphere developed through continuing physical and chemical processes. When life appeared, the biosphere interacted with the atmosphere, water and land. Each sphere influenced the others over time. Option A correctly presents this connected sequence. Option B is wrong because Earth’s events were not completely independent. Option C is too narrow: oceans were important but were not the only cause. Option D is also too narrow: ozone protected life but could not alone explain Earth’s evolution. Exam cue: a systemic answer mentions interaction, sequence and several Earth spheres.

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Systemic EvolutionEarth SpheresSequence

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