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What was the combined importance of hydrosphere and ozone for possibility of complex life?

Answer and explanation

Correct answer: Water provided medium and ozone provided protection

The direct answer is A: water provided a medium for life and ozone provided protection. Water is necessary for chemical reactions, transport of substances and the functioning of cells. Oceans and other water bodies also offered a stable environment where early life could survive. After oxygen accumulated, ozone formed in the upper atmosphere. The ozone layer absorbed much harmful ultraviolet radiation, making life outside water more possible. Option A correctly combines the two different roles. Option B is wrong because water did not form the core and ozone did not create gravity. Option C is wrong because neither water nor ozone creates solar wind. Option D is wrong because their role was not to remove the first atmosphere. Memory cue: hydrosphere gives a place and material for life; ozone gives a protective shield.

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HydrosphereOzoneComplex Life

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