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

The dark room.

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

Glen and Thomas Knoll

3.)  What year was Photoshop 1.0 released? 

1990

4.)  What feature was added to Photoshop 2.0?

Path Feature

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

1996, adjustment, and macros

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

1996

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

1998