The first non-cellular form of life could have originated about $. . . . .$ years ago.
$3 \;million$
$2\; million$
$3\; billion$
$2\; billion$
They would have been giant molecules ($RNA, DNA$, Polysaccharides, etc.,)
Louis Pasteur’s experiments, if you recall, proved that life can arise from only pre existing life. Can we correct this as life evolves from pre-existent life or otherwise we will never answer the question as to how the first forms of life arose ? Comment.
Which theory arguments that life on earth came from outer space?
Following are the two statements regarding the origin of life.
$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?
The concept that the species have changed over a long period of time is known as
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