Which of the following appeared on the Earth | vedclass

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(D) The early atmosphere of the Earth was reducing in nature,meaning it lacked free oxygen. Oxygen was released into the atmosphere as a byproduct of

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Oxygen

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(D) The early atmosphere of the Earth was reducing in nature,meaning it lacked free oxygen. Oxygen was released into the atmosphere as a byproduct of photosynthesis by early photosynthetic organisms like cyanobacteria and later by plants. Therefore,free oxygen appeared on Earth only after the evolution of photosynthetic life forms.

Which of the following appeared on the Earth with the arrival of plants and was absent in the past?

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