Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.
Answer: desert .
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The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division.
Lava flowing because it would put a lot of weight(pressure) and high temperatures
