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After oxygen accumulation which atmospheric change was decisive for land life?

Answer and explanation

Correct answer: Development of ozone layer

The direct answer is A: development of the ozone layer. Oxygen molecules in the upper atmosphere can be changed by ultraviolet radiation into ozone. The ozone layer then absorbs much of the harmful ultraviolet radiation reaching Earth’s surface. Step by step, oxygen accumulated; ozone formation became possible; ultraviolet protection increased; organisms could live and eventually expand on land more safely. Option A gives the decisive atmospheric change. Option B is wrong because solar wind is not formed by this oxygen process. Option C is wrong because the first atmosphere did not return. Option D may describe an unrelated internal process and does not provide surface radiation protection. The useful sequence is oxygen accumulation followed by ozone formation and greater suitability for land life.

Related tags

OxygenOzoneLand Life

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