Which is the smallest functional unit of the nervous system? . a. a nerve. b. a neuron. c. a receptor

The correct answer would be option b. A neuron. The smallest functional unit of the nervous system is a neuron. A neuron is a specialized cell which transmits impulses. It processes and sends information through chemical and electrical signals. Neurons are the cells that  make up the nervous system.

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.