1) On the Earth, you need oxygen, water and a source of food. Without those things, you would die because they are a necessity for life of a multi-celled organisms. That is why the Earth has "Goldilocks" conditions. Or perfect conditions for life to happen.
2) Archaeon Eon because that's when the Earth was born, oxygen started to fill the atmosphere, and the Earth's crust and oceans started to form. Those are all key events that led to the Earth being what it is today. Some of those are all also common ingredients for life to happen.
3) Not very significant at all because we haven't been here long enough to really change the pace of the Earth's development. However, we have managed to start to kill the atmosphere by polluting it with cars.
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