Answer - C
In water treatment and water purification plants, chemicals are added to destroy the bacteria when the bacteria have completed their task of digestion and are no longer useful for the process.
In mitosis a cell divides to form two identical daughter cells. it is important the the daughter cells have a copy of every chromosome, so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set. before mitosis the chromosomes are copied.
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