What function did the Grand Canal have during the Song Dynasty?

A. Easier and cheaper transportation of rice
B. Allowed for more irrigation of fields
C. Served as a barrier to invaders
D. None of the above are true

make flash cards, or have a 'study date' with your friends or something! always works for me! : d

9) a & b

10) true.

11) false.

12) false.

13) true.

14) false.

15) true.

16) true.

don't worry, i'm here to you with your struggles!

good luck!

answer; conditional stimulus will trigger a conditioned response;