1. What things had to happen were, oceans had to form. Since those oceans were created, cyanobacteria showed up cyanobacteria which created oxygen and slowly filled the atmosphere. Then when the atmosphere was filled with oxygen, multicelluar life was able to live.
2.The Archaeon Eon because that's when the Earth was born. This is also when the Earth finished stratifying and the atmosphere started showing up. Other events during this Eon was, oceans forming and heavy bombardment ending.
3.Human presence was insignificant compared to the History of the Earth because the Earth has been around for 4.5 billion years and life has only been alive for 543 million years.
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