The central nervous system (CNS), which is made up of the brain and the spinal cord, and the peripheral nervous system (PNS), which is comprised of nerves and ganglia (small concentrations of grey matter).
The brain sends messages to the peripheral nerves in the body via the spinal cord, these have control of muscles and internal organs.
DNA is the ultimate control of cell's productions. So A.
Answer:
Chromosomes are a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes. In the nucleus, the DNA is in the shape of an X, which is the chromosome. Females have two X chromosomes, while males have one X chromosome and one Y chromosome (shapes like a Y).