Can you replace the question mark with the correct number?

Solve below rebus puzzle?

What do you call a fish without an eye?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Which fur should we be getting from the Lion?

What is the longest word in the dictionary?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?