What is the main term and essential modifier in the alphabetic index

Morgan Smith had an acute myocardial infarction, commonly referred to as a heart attack

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

a population evolve