he dragon backbone pump was invented during the Song dynasty. What does a dragon backbone pump do? a. helps doctors treat bone illnesses b. helps pump water out of flooded boats c. allows one man to scoop water from one place and dump it into an irrigation canal d. automatically pumps arrows through a long tube

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

jesse stuart was a teacher in rural kentucky.

-seth

the correct answer is b.

idk