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What are chemoautotrophs?...

What are chemoautotrophs?

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Chemoautotrophs are bacteria which form organic matter from inorganic raw materials with the help of energy got from exergonic reactions.
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Name the nitrifying bacteria of the soil. Why are they called chemoautotrophs?

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Assertion (A) : The earliest organisms that appeared on the Earth were non-green and presumably anaerobis. Reason (R ) : The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Following are the two statements regarding the origin of life : A. " " The earliest organisms that appeared on the earth were non-green and presumably anaerobes. B. " " The first autotrophic organisms were the chemoautotrophs that never relesed oxygen. Of the above statements which one of the following options is correct ?