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Answer:
"Onion root tips are good to use when studying cells undergoing mitosis because root tips grow rapidly, so there will always be cells undergoing different parts of mitosis."
Explanation:
The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps.
The DNA helix is held together with hydrogen bonding. It also makes up water which is a necessity of life.