Which of the following explains why it is advantageous for more than one pattern to exist for side-blotched lizards?

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.

Idon’t know what the answer is i wish i could

Answer heart of american                  live in harmony                    hillsides of orchards                    blaze of color                    backdrop of pines;