Pope Gregory VII and Emperor Henry IV disagreed about
a.
how serfs and peasants should be treated in feudal society.
b.
who should select bishops
c.
where in Europe the church headquarters should be located.
d.
who could excommunicate people
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B who should select the bishops

Explanation:

branches of government. to ensure a separation of powers, the u.s. federal government is made up of three branches: legislative, executive and judicial. the legislative branch is made up of the house and senate, known collectively as the congress.

by improved communication.