What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

I don't get anymore wetter, no matter how much rain falls on me.