Choose the correct answers from the alternatives given . The first autotrophs probably were .......... and produced ..........
A
photosynthetic, oxygen
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B
photosynthetic, no oxygen
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C
eukaryotic, oxygen
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D
eukaryotic, no oxygen
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Solution
The correct option is A photosynthetic, oxygen The first autotrophs were bacteria who used photosynthesis to make their food and as the photosynthesis began atmosphere was enriched with oxygen. So, the correct option is "photosynthetic, oxygen".