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Explanation:
Teotihuacan
The Teotihuacan Period: 200-900 CE – During this era the great city of Teotihuacan grew from a small village to a metropolis of enormous size and influence. Early on, Teotihuacan was a rival of another city called Cuicuilco but, when that community was destroyed by a volcano c.
The correct answer is A. Nixon resigned before he could be impeached.
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Nixon resigned to try and protect some the decent reputation he had left.
The cell membrane controls what enters and exits cells and organelles.