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Primitive atmosphere was reducing/oxidis...

Primitive atmosphere was reducing/oxidising.

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Reducing
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The primitive atmosphere was reducing in nature. Free oxygen was absent in the primitive atmosphere.

Assertion : Primitive atmosphere was formed by the lightest atoms. Reason : The primitive atmosphere was reducing in nature.

Assertion : The primitive atmosphere was reducing one i.e., without oxygen. Reason : In the atmosphere, oxygen was involved in forming ozone.

Primitive atmoshpere was reducing because:

Assertion: Primitive atmosphere was of reducing type. Reason: First hydrogen atoms combined with all oxygen.

Which organisms changed earth's atmosphere from reducing to oxidising?

Primitive atmosphere of earth contained water vapours, hydrogen ,ammonia and