The central nervous system is made up of mainly the brain and the spinal cord while the peripheral nervous system is divided into two types which are sensory and motor neurons. The somatic nervous system is associated with voluntary nerves while the autonomic nervous system is also known as involuntary nervous system. The sympathetic nervous system increases or speeds up a process while the parasympathetic nervous system decreases or slows down a process.
The answer is B, multiple alleles.
Codominant is when the gene pair in a heterozygous are both fully expressed.
Incomplete dominance is when one allele is not fully expressed over its paired allele.
I can’t see it it’s too blurry