It’s in the picture to at least help you out from the best of my knowledge
Answer:
Natural boundary
Explanation:
A natural border is a physical and natural barrier that separates two places. In this context, two countries. Some examples of natural borders includes rivers, mountains, desert, and oceans
The Dominican republic and haiti are two countries that are separated by a great valley. Both countries share an island.
No because they are to small and three heads are better than one
B. The emergence of polished stone tools caused the emergence of agriculture