What was a characteristic of the Roman Senate?

It was led by two consuls who served one-year terms.
It was made up of an assembly of representatives called tribunes.
It was responsible for protecting the rights of plebeians.
It was made up of three hundred patricians who were elected for life.

It was responsible for protecting the rights of plebeians.

Explanation:

Senate especially had important role during the period of Republic. At the beginning only patricians participated in the work of Senate, but it later changed. Plebeians gained political rights after they rebelled against patricians. Plebeians at the beginning had a right to select two tribunes, who could veto certain decisions. Later, that number was changed to ten.

c

the articles of confederation placed most of the power on the feds

d.

the northwest territory became the most densely populated area in the u.s.