Please solve and give a well explained answers

A biological substance from an exotic tree is optically clear, sticky to the touch, and

undergoes some kind of reversible solid$-$to$-$liquid transition on heating. The explorers who

found the tree argue whether this behavior is due to the glass transition, crystallization, or

a reversible gelation. Based on the observations, what explanation seems most plausible?

Back in the lab, how should they test their hypothesis?