(C) The evolution of the first life forms,which were unicellular organisms (prokaryotes),occurred during the $Archaeozoic$ era (also known as the $Arc

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(C) The evolution of the first life forms,which were unicellular organisms (prokaryotes),occurred during the $Archaeozoic$ era (also known as the $Archean$ Eon). This era marks the early history of Earth,where simple life forms first appeared in the oceans approximately $3.5$ to $3.8$ billion years ago.