Its executing power. The president has authority over the U.S. so the president is in the Executive Branch.
Answer:
the number of student interactions
Explanation:
Based on the information provided within the question it can be said that the effect that is being described is that of the number of student interactions. This can be said because it seems that larger rooms have more enthusiasm because there are a far greater amount of students and thus there are more interactions among the students as opposed to a smaller room with less students.
