Abiogenesis means
Origin of life from non-living organisms
Origin of life from living organisms
Origin of viruses and microbes
Spontaneous generation
$A$ : 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 first life on the earth was developed through
Which of the following breakup water into hydrogen and oxygen on early earth?