This is false. There are elements that have three letters, however they don't occur as often as those with one or two letter formulas.
Oxygen and Hydrogen Atoms!
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it is important bc we need more humans on earth. cause if everyone stopped 'reproducing' when we all die nobody is going to replace us.
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Answer:
It was Discovered on May 20, 1964, By American radio astronomers Robert Wilson and Arno Penzias discovered the cosmic microwave background radiation (CMB), the ancient light that began saturating the universe 380,000 years after its creation.
Explanation: