1.)  What was Photoshop based off of in traditional photography?

       DarkRoom

2.)  Who were the two people that combined knowledge to create Photoshop?

       Thomas Knoll, Glen Knoll 

3.)  What year was Photoshop 1.0 released?

       1990

4.)  What feature was added to Photoshop 2.0?

       the Path feature, which allowed users to trim around an object easily and to save that path for future use. 

5.)  When was the layers feature introduced and what are layers?

       photoshop 3.0-1994, Layers are individual slices of the image that go together to make the       final “sandwich” of the image.

6.)  When did the unification in the Photoshop interface happen?

       1996

7.)  When did the lasso selection tool and the history feature appear?

      1998