The sail-like fin on the pelycosaur may have served as all except which of the following?

Question

Quizplus · Accepted Answer

The sail-like fin on the pelycosaur is believed to have functioned as a thermoregulatory device, helping to regulate the animal's body temperature. While it is possible that the sail had some role in locomotion, there is little evidence to suggest that it helped the animal to move more efficiently. Additionally, the sail was likely too fragile to serve as a means of protection or defense, and there is no evidence to suggest that it was used as a sexual display.

The Sail-Like Fin on the Pelycosaur May Have Served as All