nerves are responsible for carrying messages from the brain and spinal cord to other parts of the body and causes muscles to move.

A Skeletal
B Sensory
C Motor
D Axial

C.

Motor nerves are responsible for muscle movement, etc. (also, the definition of motor (the adjective) is "giving, imparting, or producing motion or action" )

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

answer; incomplete dominance;