Answer:
1.an atom that has gained or lost electrons:

2. produces OH - ions when added to water:

3. produces H† ions when added to water:

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Answer:
Around 1850, Virchow saw cells dividing and added that living cells arise only from other living cells. These ideas led to cell theory, which states that all organisms are made of cells, all life functions occur in cells, and all cells come from other cells.
Explanation: