What are the two citation styles commonly used in academic work?

Consider the difference between concrete and abstract terms. First define these concepts, and then select a term and develop an accompanying ladder of abstraction with at least five levels.

What will be an ideal response?

Caleb and Cassandra have dated for six months. During that time, they have increasingly shared more personal and private information about each other and their families. Which stage best characterizes their relationship?

A. initiating B. experimenting C. intensifying D. integrating