Answer:
RNA
Step-by-step explanation:
Oparin-Haldane hypothesis says that the life gradually arose from amino acids and then they combining to make the complex polymers.
Miller-Urey experiment provided first evidence that the organic molecules needed for the life could be formed from the inorganic components.
Currently, Scientists support RNA world hypothesis. It suggests that first life was the self-replicating RNA. Thus, RNA is vital molecule for the early life.