(01.01 LC) Which physical feature includes some of the highest peaks in North America? Mojave Desert Rocky Mountains Mississippi River Great Plains

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

the answer is:

a. a closed question always has yes or no​ answers, whereas an open question is a​ free-response question.