Answer:
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Explanation:
About 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.
B. because the match contains phosphorus, and it is unlit, so it has chemical POTENTIAL energy
The answer for this question is D.Mechanical weathering of very fing grained blue grey clays
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