Final answer:
The paragraph supports the idea that happiness is closely tied to a sense of belonging and the connections and relationships individuals have with others.
Step-by-step explanation:
The details in the paragraph develop the theme "Having a sense of belonging is crucial to happiness" by illustrating that people derive happiness from their connections and relationships. This is seen through references to close relationships providing more than happiness and fulfillment, and the mention of intrinsic human needs such as affection and a sense of belonging, influencing well-being. Additionally, the paragraph addresses an environment and lifestyle that promote belonging, responsibility, and love, which are instrumental in achieving happiness beyond the mere pursuit of material wealth, such as money.