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After biosphere appeared what new type of effect entered the Earth system?

Answer and explanation

Correct answer: Change in atmospheric composition by organisms

The direct answer is A: organisms changed atmospheric composition. The biosphere means all living organisms and their living processes. When photosynthetic organisms appeared, they used carbon dioxide, water and sunlight to make food and released oxygen. Step by step, life began in the available Earth system; photosynthesis increased oxygen; the changed atmosphere then supported different forms of life. Option A is correct because it describes a real effect of life on the atmosphere. Option B is wrong because Earth’s core does not make solar wind. Option C is wrong because oceans do not end gravity. Option D is wrong because the Moon did not form Earth’s crust in this process. The key exam idea is that the biosphere is not only a receiver of environmental conditions; it is also an active force that changes them.

Related tags

BiosphereAtmosphereOxygen

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