honda accord oil pump research help?

I'm doing a research project on the Honda accord LX 2006 and I have a few questions... i tried looking it up but i couldn't find anything. first question: what system is the oil pump located in? second: whats its function? third: what happens when it stops working? fourth: how much would a brand new oil pump cost (Honda store value)? fifth: how much would labor cost to get it installed ( from Honda manufacturers, etc...)? if someone could please help me out it would be greatly appreciated and of coarse best answer WILL BE rewarded 10 pts. thanks!

P.S.: the parts and labor price need to be separate, and researched at any official Honda website, or dealership... Thanks again!
 
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