What biochemical reactions are altered due to Down syndrome? Then how do those biochemical changes affect the person on a phenotypic level

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.

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x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

the answer would be d : p