Answer:
For early earth, it was filled with loads of oxygen and could kill humans if they breathed the oxygen that was in the air about 100 million years ago. This massive amount of oxygen cause massive creatures like the dinosaurs to exist. Current earth has an atmosphere with not too much oxygen.
Explanation:
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Well, the cell wall only appears in plant cell along with the chloroplast which is the energy making of the plant cell.
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This skin is known as the body membrane
