Final answer:
Enduring-dynamic couples are characterized by stable, long-lasting, and adaptable relationships with strong emotional bonds and a high level of commitment, contributing to their marital success.
Step-by-step explanation:
The type of couples referred to as enduring-dynamic couples in studies of marital relationships are those characterized by a steady, long-lasting bond that adapts and evolves over time. These couples typically experience less conflict, have a strong emotional connection, and demonstrate a high level of commitment to their marriage, which contributes to their long-term success as partners. It's important to look at the context of these findings within the broader research on marriage and relationships to understand the specific dynamics that contribute to the classification of enduring-dynamic couples.