Polysaccharides? Their origin?
The synthetic chemists do not have a pathway.
The biologists do not have a clue.
Those who think scientists understand the issues of prebiotic chemistry are wholly misinformed. Nobody understands them. Maybe one day we will. But that day is far from today. It would be far more helpful (and hopeful) to expose students to the massive gaps in our understanding. They may find a firmer—and possibly a radically different—scientific theory.
The basis upon which we as scientists are relying is so shaky that we must openly state the situation for what it is: it is a mystery.