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Choose the most logical order of sentences from among the given choices to construct a coherent paragraph. 1. Yawning, although often seen as a simple reflex, has been a subject of scientific curiosity for many years, with various theories attempting to explain its occurrence. 2. Another theory suggests that yawning could have evolved as a social signal, helping to synchronize group behavior in social animals. 3. One of the leading theories is that yawning helps cool the brain, enabling it to maintain an optimal operating temperature for improved cognitive functioning. 4. Despite these theories, the exact cause of yawning is still not fully understood, and more research is needed to uncover its true purpose.