1) Will a 300 dpi image or a 72 dpi image be clearer when printed out at the same size? How come?

A 300 dpi image would be clearer when printed ou at the same size because more details will be shown in the picture.  If you were to print a 72 dpi image it would be blurry and small.  You wouldn’t be able to see details.

2) What would a picture created at 1 dpi look like?
A picture at 1 dpi will look very small.  You wouldn’t be able to see anything and it would be very blurry and small.