In a human diploid somatic cell (2n), there are 22 chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes - 22 pairs of autosomes and 1 pair of sex chromosomes. There are in total 46 chromosomes (23 pairs in 2 copies: 23 × 2 = 46).
The answer is D. Enzymes in the body need to be around the pH level of 7 to function best, and if the blood drifts too far away, some enzymes stop working all together
