Answer:
2.11 billion years.
Explanation:
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They achieve stable structures by sharing their single, unpaired electron.
<span>The appropriate response is filtration. Filtration is any of different mechanical, physical or organic operations that different solids from liquids by including a medium through which just the liquid can pass. The liquid that goes through is known as the filtrate</span>
The answer would be D because from my research it's the only one that didn't have a catalyst
