Fighting between Africans destroyed societies.
The unit used to express volume is the cubic meter. This is the SI unit for the volume of a solid, gas or liquid. Volume is also expressed in units like liter, gallon, quart, pint, fluid ounce and cup.
Where is the rest of the question
Answer: A. drought
Explanation:
It is A because their environment changed alot so it was difficult to grow corn and so the migrated south where it rained more.
