I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Why 1729 is a magic number? Answer Logically.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

The more you take me, the more you leave me behind.
Who Am I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What word begins and ends with an E, but has only one letter?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Give it food and it will live; give it water and it will die.

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?