Scientists break down evolution into catogories

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

What noticeable trend from this graph might be used to make a conclusion?