Dynamic scroll bars.
Change the default table name (e.g. "Table1") to something descriptive.
Delete overlapping columns.
Place clipart over important numerical regions.
Nothing, the table is perfect without changes.
The table automatically grows to capture the new added data.
Excel will ask if you'd like to add the new row of data to the preexisting table.
Whatever you place at the bottom of the table will be overwritten with summary data.