Which of the following biological molecules acts as a messenger?

Which $RNA$ has the shortest lifespan?

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:

Which molecule was considered the breakthrough of the year $2002$?

Which of the following is a type of $RNA$?

Which of the following $RNA$ is non-functional?