Absence of oxygen in earth, made the atmosphere reducing. But it later became oxidizing in nature due to the emergence of ________

Absence of oxygen in earth, made the atmosphere reducing. But it later became oxidizing in nature due to the emergence of ________

(a) Angiosperms

(b) Gymnosperms

(c) Eukaryotic algae

(d) Cyanobacteria

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Asked question is from Evolution topic in section Evolution of Biology – Class 12

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Absence of oxygen in earth, made the atmosphere reducing. But it later became oxidizing in nature due to the emergence of ________

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