Adobe Illustrator CC Classroom in a Book (2019 Release), First Edition

Drag across any remaining artwork below the acorn top to erase it (see the figure at right).

Select the Selection tool ( ), and drag the top of the acorn onto the bottom of the acorn,
centering them as best you can (see the following acorn figure).

Click the Arrange button towards the bottom of the Properties panel to the right of the
document and choose Bring To Front to bring the top of the acorn on top of the bottom.