$RNA$ shows the following characters $EXCEPT$ . . . . . . .

Identify the incorrect statement about $RNA$.

How many main types of $RNA$ are there?

$mRNA$ was named by:

Given below are two statements:
Statement $I$: $RNA$ mutates at a faster rate.
Statement $II$: Viruses having $RNA$ genome and shorter life span mutate and evolve faster.
In the light of the above statements,choose the correct answer from the options given below:

The evolution of $DNA$ occurred through the chemical modification of which molecule?