The invisible primary a. takes place in the democratic party, but not the republican party. b. takes place in the year prior to a presidential election. c. is typically won by the person who is either the most liberal or the most conservative. d. is another term for the presidential caucuses. e. takes place in the republican party, but not the democratic party.

The answer is c. "is typically won by the person who is either most liberal or the most conservative".

Explanation:

This happens because of the way closed primary elections are run. Where only the affiliated members of either the Republican or the Democratic party can vote. Therefore, the candidates running tend to only represent people on the the (literally) extreme sides of the political spectrum.

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.