Answer:
sporopollenin
Step-by-step explanation:
Charales are a group of vegetables that are the closest relatives of the higher plants. In Charales occurs the full differentiation of tissues occurs. The charales are organisms that have alternation of generations in their life cycle, besides having many characteristics that were conquered through evolutionary processes, these characteristics brought many advantages that contribute to the survival of these organisms. Among these characteristics, we can mention the existence of sporopollenin which are evolutionary structures that allow the Charales to survive long periods of drought.