What is harder to catch the faster you run?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

People make me, save me, change me, raise me. What am I?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What is both possible and impossible at the same time?

Which tank will fill first?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?