The following which occurred first in the history of life is the beginning of atmospheric accumulation of O₂ and is denoted as option D.
This is referred to as a chemical element which has an atomic number of 8 and is also an important gas which is used during the respiration process kin organisms. Plants give off this gas as a product of photosynthesis thereby making it available.
For organisms to survive. there must be the atmospheric accumulation of oxygen gas which is why it occurred first around billions of years ago in the history of life.
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