NEET 2016 Biology question
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?
Answer: (3)
Solution
The earliest organisms (protocells) were heterotrophic, non-green and anaerobic, because free oxygen was absent in the primitive atmosphere, so (i) is correct. The first autotrophs were
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