The first originated organisms were prokaryotic chemoheterotrophs and oxygen was not available on earth at that time so it must be anaerobic too. Even the first autotrophs were dependent on chemicals as oxygen was not released.
NEET UG 2016 — Zoology Evolution
Following are the two statements regarding the origin of life:
(i) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(ii) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?
Held on 30 Apr 2016 · Verified 9 Jul 2026.
(i) is correct but (ii) is false
(ii) is correct but (i) is false
Both (i) and (ii) are correct
Both (i) and (ii) are false
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