Absence of oxygen on the earth, made the atmosphere reduce. But it later became oxidizing in nature due to the emergence of ________
A. Angiosperms
B. Gymnosperms
C. Eukaryotic algae
D. Cyanobacteria
Answer:D
Absence of oxygen on the earth, made the atmosphere reduce. But it later became oxidizing in nature due to the emergence of ________
A. Angiosperms B. Gymnosperms C. Eukaryotic algae D. Cyanobacteria