Answer:
Ion
Explanation:
An Ion is exactly as stated it bears either a positive or negative charge.
Going down A-D
Going across is 1-4
A 4
B 3
C 1
D 2
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It would be B.pyramid of numbers
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The astronomical unit, otherwise known as AU is used to measure long distances in the universe.
In photosynthesis oxygen is released to the atmosphere which means the third option is correct.
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