What can go up a chimney down, but can't go down a chimney up?

Readers with excellent focus can find three differences between the camping scene pictures in 16 seconds. Can you? Test your eye power now!

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?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What breaks yet never falls, and what falls yet never breaks?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

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

What Word am I Looking For ?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

I am the fastest animal but cannot climb the tree. What am I?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.