Match the geological eons/events in List I with the biological milestones in List II.

List I (Time Period/Event)	List II (Biological Milestone)
A. 4.0 - 3.8 Billion years ago	I. Appearance of first Eukaryotes
B. 3.5 Billion years ago	II. Oxygen Revolution (Great Oxidation Event)
C. 2.7 - 2.5 Billion years ago	III. Appearance of first cellular life (Prokaryotes)
D. 2.0 - 1.5 Billion years ago	IV. Formation of life precursors (RNA/Protocells)

#Question id: 10337

#Life Sciences

In biological nitrogen fixation, the process of nitrification by organism respective bacteria A--which convert the ammonia to nitrite and B--- further converted into nitrate in the soil by their respective A and B bacteria known as;

#Question id: 10337

#Bio-Informatics

In biological nitrogen fixation, the process of nitrification by organism respective bacteria A--which convert the ammonia to nitrite and B--- further converted into nitrate in the soil by their respective A and B bacteria known as;

#Question id: 10337

#Applied Microbiology

In biological nitrogen fixation, the process of nitrification by organism respective bacteria A--which convert the ammonia to nitrite and B--- further converted into nitrate in the soil by their respective A and B bacteria known as;

#Question id: 10337

#Environmental Science

In biological nitrogen fixation, the process of nitrification by organism respective bacteria A--which convert the ammonia to nitrite and B--- further converted into nitrate in the soil by their respective A and B bacteria known as;

#Question id: 10338

#Botany

Nitrate from the soil solution actively absorb by Plant roots via several low- and high-affinity transporters known as

#Question id: 10338

#Plant Biotechnology

Nitrate from the soil solution actively absorb by Plant roots via several low- and high-affinity transporters known as