I edited the question before you posted. Check it again.

Is it only practiced by humans?
Without it, could we keep living (even if it's not a decent life)?
Do we usually practice it at least once every minute?

Edit:
Is it breathing?
Is it procreating?
Is it walking?

Is it sex? Damnit chia beat me.

No.
No.
No.
k.
For simplicity: *Yes.
Yes.
No.

Is it practised by every human?

Is it masturbation

Is it thinking?
Is it evolving?

Yes.
Haha. No.
No.
No.

Is it talking?

No.

Is it war?

Birthday?

Does a person have to be awake to do it?

No.
*Yes.

Post has been edited 1 time(s), last time on Jun 26 2010, 7:31 pm by Tuxedo-Templar. Reason: Removed asterisk on #1

Is it fighting?
Is it arguing?
Is it competition?
Does it require more than one human to practice?

Is it related to a birthday?
Is it a birthday?

Does one have to be fully developed to do it? Could a baby do it?

No.
No.
No.
*Yes.
No.
Yes.

Edit: No.

Is it a handshake? A high five? A buttsmack?

Is it love?
Is it an emotion?

Is it Communication?

Is it a celebration?
Is it related to the bible?
Is it related to the way we grow up?

Is it growing up?

No.
No.