Which sequence represents structures organized from least complex to most complex?

1.

nerve cell → nucleus → nervous system → brain
2.

nucleus → nerve cell → brain → nervous system
3.

brain → nervous system → nucleus → nerve cell
4.

nervous system → brain → nerve cell → nucleus

When mitochondrial dna from living relatives was compared with mitochondrial dna from the skeletons, scientisits determined that skeletons 3,4,5,6 and 7 were members of the romanov family. which of these skeletons can be identified by name based on the evidence you have? explain your answer.