Answer:
C: larger river systems
D:fewer geographic barriers
Explanation: I just did it
<h3>
Hey! </h3>
<em><u>The following attached images shows all of the Math conversion units!</u></em>
Hope this helps! °ω°
The Mongols spread the use of gunpowder.The Mongols controlled both China and Russia.<span>Pax Mongolica encouraged trade along the Silk Road. I would honestly say these are the main effects of the Mongol incursion into Europe and Asia plus the inadvertent introduction of the bubonic plague of infected rats from Asia to Europe.</span>