What innovation under the Sung dynasty made trade quicker and easier? paper currency
O the spinning wheel
irrigation canals
O woodblock printing

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p

Read your textbook to answer that question

Sometimes but itt depends, their is a lot if drugs on campus too so you really can't just say that