I would believe its either Continental Drift or plate tectonics
The answer is D. The Palaeozoic era was characterized by the supercontinent of Pannotia which was located at the current position where Chile is, 500 million years ago. There is evidence that shows that central Africa was once at the polar regions due to evidence of glaciers in its geological rocks. Due to tectonic movement, the Appalachians and the Ural Mountains were formed in the resulting Pangea supercontinent.
This question actually refers to body parts: otoliths are small structures in your inner ears (in the semicircular canals, so this part is correct) that shift when you move - to help you sense your body position (so this part is also true).
But they're not exactly stones - they are small particles, so that's why the statement is false.
The drawing of the boundaries in the manner of the interest of the European colonial powers resulted in very big problems once the African countries were granted independence.
The problems were mostly because people from the same ethnic groups were separated by borders, but were in the same ones with people from other ethnic groups, usually historical rivals with whom they had bad relations. Also, the religious factor had a big influence, as there were multiple countries were some parts were predominantly of one religion, and other parts of other religion, and that brought in even more tensions.
That has resulted in instability, constant tensions, civil wars, terrorist organizations, separatist movements, genocides, pretty much everything that is not supposed to happen for a country to prosper.
