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

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

What Does this text mean:

important=important

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

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

Identify the 10 differences between the two given pictures.

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?