What happens when multiple collaborators are editing a survey at the same time?

I've shared a survey with a collaborator and I see that Qualtrics gives us a notification when we are both editing the survey at the same time ("Multiple people are editing this survey and you might impact each other's changes. Changes won’t be live until you select Publish.") It isn't clear, however, what is meant by "you might impact each other's changes." I had a few questions about this. 1. If we are editing different parts of the survey or survey flow, will both user's changes be saved and published, regardless of who publishes the survery? 2. If we are editing the same block or survey flow, whose changes will be saved? 3. When will changes made by one user show up on the version that the other user is looking at? Thanks, Dan