If I embed Youtube media in my classroom, can I rely on it in the future? In other words will it always be in the classroom, whether or not the media is taken down from Youtube?
it's essentially just a link - if it's removed from Youtube, your class won't have access. You could copy the video, upload it to a video hosting service, and embed that, but that does mean you'll need to take a much closer look at the copyrights surrounding the content and pay for a video hosting service.
Yes, John, what Anthony described has happened to me on many an occasion. I periodically browse through my resources (and that includes quizzes) to make sure the embedded YouTube videos are available. I also task my students with informing me if any resource--be it an embedded video or a link to an external resource--no longer works.
Retrieving data ...