Which type of respiration probably arose firs | vedclass

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(D) The primitive atmosphere of the Earth was reducing in nature and lacked free molecular oxygen $(O_2)$.Since oxygen was absent,the first living org

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Anaerobic as early atmosphere contained no free form of oxygen

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(D) The primitive atmosphere of the Earth was reducing in nature and lacked free molecular oxygen $(O_2)$.Since oxygen was absent,the first living organisms must have been anaerobic,relying on anaerobic respiration to derive energy from organic molecules.Aerobic respiration evolved only after the accumulation of free oxygen in the atmosphere,which was primarily produced by photosynthetic cyanobacteria.

Which type of respiration probably arose first?

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