What does this below rebus puzzle mean?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What time is it when an elephant sits on a fence?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

Prove that twice of ten is the same as twice of eleven.

Can you identify the famous TV character from the rebus below?

Can you replace the question mark with the correct number in the below table sequence?