Assuming height of the bar represents altitude, the bar representing Han Chinese will be shorter compared to that representing Tibetans since Han Chinese live at lowlands.
Tibetans and Han Chinese are thought to originate fro. same ancestors.
However, while the Han Chinese lived in lowland areas, Tibetans split off drom the Han Chinese about 2750 years ago and went on to live in high altitudes.
Natural selection helped Tibetans to evolve to adapt to high altitudes with several mutations occurring in their genes which are mostly related to use of oxygen by the body.
Assuming height of the bar represents altitude, the bar representing Han Chinese will be shorter compared to that representing Tibetans.
Learn more about natural selection at; https://brainly.com/question/524043