How to copy a iPhoto slide show to a keynote presentation

Not unless you do it manually. Open both applications. Make a title slide in Keynote, and then copy all of the photos onto individual slides. Select all the slides, and open the inspector (command-option-i). Go to the transitions tab, and make sure each slide advances automatically, with whichever delay you'd like. Then, go to the general tab, and make sure the slideshow loops continually.

Thanks Connerdy. I thought I was going to have to do that.

Select the images you need from: Home > Pictures > iPhoto library > select and drag the images into the Navigater side panel of Keynote.