What are two ways the seniority rule is used in committee appointments?

Explanation:

The elected presiding officer of the House and the acknowledged leader of their majority party.

Chairs decide when to meet, which bills to take up, whether they will hold public hearings, and what witnesses the committee should call. 1) How does the seniority rule function? ... The longest-serving majority party member of a committee is almost always the head of the committee. Seniority rules over all.