RIddle me, riddle you!

I am a room without walls, windows or doors. What am I?

Just to clarify why I'm right and the answer is mushroom...

Does a mushROOM have walls, windows, or doors?

I know! You don't need to make a big song and dance out of it...geez...

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Right, new riddles...

What goes up, but must come down; When you look at it, its like a mirror; It can be an abundance, and it can be scarce?

No matter how you look at me I always look the same to you,
The only way you can see the difference is by looking at pictures of times gone past,
You see me everyday and yet you only notice me when you want to,
I'm the hardest person to forgive, yet the easiest person to live with,
I am the one who is always there. Who am I?

I am the beginning of the end, and the end of time and space. What am I?

I was just clarifying it. If people didn't catch the room at the end of mushroom, it's actually a pretty oddball answer.

1.

2.

3. The letter E. Too easy.

Only one I can figure out right now. Too early to think.

1. A boner!

2. Yourself?

3. E

3rd one is E yep.

2nd is yourself...

And the first...not a boner...

All too easy. The first is water.

Yep.

You got 'ny more??

1 could have so many different answers that I figured it was a trick question somehow. It could also be silver, mercury, glass, anything like that.

Don't go googling it to get the right answer...I say the answer's water, and my god, the answer's water...K?

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Anyone else got any more riddles???