Construct a 2 page essay paper identifying expanding on and providing examples for the four theories that unify biology as a science. Completely and professionally address the topic. Must be a minimum of 2 pages of text (excluding title page and literature cited page). Include title page with your name assignment title course number course title and date of submittal. Include literature cited page (all literature cited must be in APA format). Text must be double spaced. Text font must be the following (Size 12 pt. Times New Roman). Must have 1 inch margins and 1 inch header and footer.