$A$ : During evolution the early time period was without ozone layer. $R$ : Ozone layer absorbs $U.V.$ rays to some extent.
First autotrophs on the primitive earth was/were
The complex organic compounds that may have first evolved in the direction of origin of life on earth, may have been
Describe various theories of origin of life.
Assertion : The primitive atmosphere was reducing one i.e., without oxygen.
Reason : In the primitive atmosphere, oxygen was involved in forming ozone
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