The microorganisms developed FIRST due to the early environmental conditions on Earth were prokaryotic and anaerobic (Option b). Moreover, eukaryotic cells evolved from simpler forms of life.
The first microorganisms were prokaryotes that evolved in absence of oxygen.
These prokaryotic microorganisms originated approximately 4 billion years ago. During this period, the earth's early atmosphere did not contain oxygen gas.
In consequence, the first microorganisms were anaerobic bacteria (i.e., prokaryotes), which evolved in absence of oxygen.
Moreover, the first eukaryotic organisms appeared approximately 1.5 billion years ago and evolved from simpler forms of life (i.e., prokaryotic microorganisms).
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