1. Which means of warfare is described in this passage? (A) guerilla
(B) nuclear
(C) biological
(D) trench

???

Explanation:

I dont see a passage but I can try to give a example of each. 1). Guerilla warfare is like getting hit or hitting the enemy from both sides.usually in a dense wooded or jungle area. 2). nuclear. huge bomb takes out large part of country. 3 biological. this type is when a person uses a decease to attack people. 4). trench, used in world War 1 soldiers would live fight in trenches.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!

i think it’s will be a yes