How can i cut the audio from 1 file and put it on another?

I have these2 files of the same movie, 1 is amazing quality but theres no audio. the other is crummy quality but has perfect audio. How can I cut the audio from the good audio version and paste it onto the good video file?
btw i have quicktime pro is that changes anything

Open the movie and press "Command J". This will bring up the properties window. Click on the Audio Track or Video Track and the "Extract/Delete" buttons will light up. Click "Delete" and it'll delete the currently selected track, click "Extract" and it will extract the selected track into a new movie. Just use Delete on the correct track and you're halfway there.
Then, select the movie that is just an Audio Track now, do "Command A" then "Command C" to copy the audio track. Go to the movie that's just a video track, move the insertion point to the beginning of the video then do "Option Command V" to add the Audio Track to the Video Track side by side.

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