<span>DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.</span>
B. Eukaryotic cells
Humans are categorized as eukaryotic organisms.Which means that all human cells can be found with a nucleus. Eukaryotes can found in things like the brain, the heart,the muscles,and such more.