During a long drought, many deer become weak because a basic need is not being met. what requirements for life are the deer most likely lacking? enough space enough water adequate shelter ability to find mates

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.