Question

Fill in the blanks with appropriate words .
The most significant event in chemical evolution was the origin of .......... type of molecules.

Answer 1

It now seems certain that RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came onto the scene. However, single-stranded RNA is rather unstable and is easily damaged by enzymes.

So, the correct statement is 'The most significant event in chemical evolution was the origin of the self-replicating type of molecules.'