Final answer:
Ella and Hanna's friendship, despite their contrasting personalities, exemplifies complementarity, which suggests that their differences contribute positively to their relationship.
Step-by-step explanation:
The continued friendship between Ella and Hanna, despite their contrasting characteristics, demonstrates complementarity. This concept means that sometimes, differences in personalities can actually enhance relationships, because each person contributes different qualities that benefit the friendship, leading to a more dynamic and balanced interaction. Complementarity can offer a sense of completeness and enable individuals to grow and learn from each other. Therefore, complementarity, rather than similarity, is sometimes the key in forming and maintaining fulfilling relationships.