Answer fast please do in 5 mins Body system that controls the body's responses to changes within the body and outside of it. This system uses electrical impulses to send messages.
A. Respiratory
B. Nervous
C. Skeletal
D. Excretory

B is the answe

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.