A. controlling rivers to provide irrigation B. mountains preventing invasions from the north.
C. the Nile river forming a delta
D. Salty Sea waters

Need this for a test asap

The principle of checks and balances is based on the notion that

Humans are the only animals capable of communication

Which factor contributed to the rise of african empires such as ghana and mali ? a. their creation and involvement in trade networks b. they focused only on agricultural production. c. they didn’t engage in warfare with other nations d. their geographic location protected them from attacks.