Multiple choice Which of the following was the age of prokaryotic microbes? Precambrian Proterozoic Azoic Palaeozoic Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Proterozoic Eon (2.5 billion to 541 million years ago) was dominated by prokaryotic life. The Precambrian is a broader term, Azoic means "no life," and Paleozoic saw the emergence of complex multicellular life.