Which option lists the layers of the rainforest in the correct order from top to bottom? emergent layer, canopy, forest floor, shrub layer
emergent layer, canopy, understory, forest floor
forest floor, emergent layer, canopy, understory
forest floor, understory, canopy, emergent layer

It dont even matter because at the end of thre day we gone life like it ius s

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.