At a point i guess all that existed was bacteria before plants, animals, or any existing thing had existed. Then because of climate change through out the years the first ice age was made. This ice age seemed to almost extinguish all life off Earth cause all because of bacteria. Somehow grass helped out this situation and helped oxygen to be in the picture more. This oxygen helped to keep the earth warm.
Bellows, Alan. How bacteria almost destroyed all life. DamnInteresting. 28 August 2008.
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