Subdivision of the PNS that controls voluntary activities such as the activation of skeletal muscles.
A. Autonomic Nervous system
B. Central Nervous System
C. Peripheral Nervous System
D. Somatic Nervous System

The peripheral nervous system (PNS) is divided into the somatic nervous system and the autonomic nervous system. The somatic nervous system (SoNS) is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles.

haploid cells;

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.