Print sources include any material that is found in print: a traditional book, magazine, or newspaper. In these times of multiple electronic sources, it can be confusing to determine which sources are identified as print. Even if you find a source in an online database, if there is a print (paper) copy somewhere, then you can list this source as print.
The Dog ran from the tree to the swing set is the answer. because it moves across the same plane and doesn't turn or reflect across any axis' and it doesn't shrink or grow. Hope it helped!