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प्रश्न
When did the first cellular forms of life appear on Earth?
पर्याय
200 mya
350 mya
500 mya
2000 mya
MCQ
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उत्तर
According to the chronological account of evolution, the first cellular forms of life appeared about 2000 mya (million years ago). Some of these early cells released oxygen into the atmosphere, which was a crucial development for life on Earth.
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