Thank you for your email.
The Discover More worksheets in lesson 2 are the only ones that need to be done. They are required for your answers to the discussion boards for that lesson.
The other ones are really for you as a self -study/check guide for exams. They do no need to be handed in.
Please let me know if I can assist you further and best of luck and success as you move forward in your courses.
Betsy Reichart
Instructor and Librarian