The death of probably kept Europe safe from Mongol invasion. Ogodei Khan
Kublai Khan
Chagatai Khan
Batu Khan

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.

i think the answer's are a) b) and c)

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.