What has one letter and starts with an E?

What demands an answer, but asks no questions

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the riddle which can be asked all day with a different correct answer each time.

The more of this there is, the less you see. What is it?

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

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

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?