Answer:
1. Hierarchy System
2. Ecumenical order
3. doctrine
Explanation:
1. The Hierarchy system is simply an organizational structure with different vertical levels or layers of authority.
2 & 3 The ecumenical order is the body that originated from the catholic church that was largely concerned with the unification of the church all around the world as such needed to put forward an official doctrine to be practiced all around the world.
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