The cyanobacteria changed the composition of the earth’s atmosphere by evolving oxygen in what is referred to as the Great Oxygenation Event. This also allowed the ozone to be formed and block off most of the UV rays that are destructive to genetic material. Life was, therefore, also able to exist on land other than in water.
Answer:
The same number of each type of atom will always be present before and after a chemical reaction takes place.
Explanation:
Your answer is D
Gravel sized particals
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