does iphoto duplicate files after they are imported from folders

Hey,

So basically i take pictures then import them into Lightroom which i use for editing and then end up in a Folder 'xxxyyy' under the default Pictures folder. From there i import them into Iphoto as an event 'xxxyyy'.

After i import the files to iphoto can i delete the folder 'xxxyyy' from my HDD. I guess what im asking is that am i causing duplication of files/photos by doing what i am doing.....

Also if you look at the attached screen shot - is that picture correct??? I mean i can't access files individually in my iphoto library through the finder when im trying to attach them in an email.

Really confused and could really use some help in this area.

thanks