Final answer:
Somatic cells include body cells like lung, skin, and brain tissue, and are diploid with 23 pairs of chromosomes, while sex cells or gametes are haploid with half the number of chromosomes. The cells not included in somatic cells are the sex cells (gametes).
Step-by-step explanation:
Somatic cells include all cells that make up the body, except for the reproductive cells known as gametes. Somatic cells, such as lung cells, skin cells, and brain tissue, contain 23 pairs of chromosomes, making them diploid, which means they have two copies of each chromosome - one from each parent. In contrast, gametes, which are not somatic cells, contain only one set of chromosomes, making them haploid, and have half the number of chromosomes compared to somatic cells. Therefore, the answer to the question is: Somatic cells include all of the following EXCEPT:A sex cells (gametes).