Activity 1 Don't worry be Happy
The word I was given to define is objects. Every object in actionscript is defined by a class. A class is like a template or blueprint for the type of object you are using. This link can help you understand the term more.
http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f9f.html
Activity 2
Activity 3
Rich Activity