What does this below rebus puzzle mean?

Find the next number in the series below.

6 18 270 72090 ?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

What do you call a fish without an eye?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

Make a sentence consisting of three words that have the whole alphabet.

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

They are three errirs in this question. Can you find them?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?