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During biological evolution, the first living organisms were _______(a) Autotrophs(b) Heterotrophs(c) Bacteria(d) MycoplasmaThe question was asked in an online quiz.My question is from Biological Evolution in chapter Evolution of Biology – Class 12

Answer»

The correct choice is (b) Heterotrophs

Easy explanation: Heterotrophs were first living organisms to EVOLVE, as they originated among organic molecules and oxygen-free atmosphere. They were anaerobes capable of respiration in the absence of oxygen. They only DEPENDED on the EXISTING molecule for their NUTRITION.



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