The shapes that do not directly exist are very few. There are mostly all the shapes in Shapes column in insert.
shapes Gallery
shapes
The Shapes button is located within Insert tab (or even the Home tab) of the Ribbon.
For Powerpoint 2007: Insert --> Shapes --> Callouts... pick a speech bubble. Type the text into the space provided.
Drawing
Yes it can be.
25
Graphics can refer to any photos, drawings, shapes or any of the built-in elements that Powerpoint provides, like flow chart elements etc.
Flash videos can be played from inside PowerPoint. However, a flash video capable player must exist on the computer or PowerPoint cannot play them.
yes they exist in shapes
shapes
Powerpoint is not designed to directly open Excel documents. Powerpoint can import spreadsheets and charts and you can copy data from Excel into Powerpoint. Powerpoint also has a built in feature for creating very simple spreadsheets and charts.