Shaina uses a shovel to dig a hole to plant a tree. A shovel is an example of a compound machine because it is made up of what two simple machines?

Machines can be classified into two categories: Simple and Compound

A simple machine is a basic device used for applying a force to produce a certain outcome. for example: lever, wedge, inclined plane are all simple machines.

A compound machine is a combination of simple machines.

In the given example: Shovel is a compound machine which is a combination of wedge and lever.