In your own words, describe the structures in and the functions of the nervous system. include the major organs and how they work within the body system. what are the symptoms of a failure of this body system?

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.