An example of a grad-school level question?
In what type of rock would a geologist most likely find evidence of ancient life?

An example of a grad-school level question?
When a switch is used in an electrical circuit, the switch can

An example of a grad-school level question?
In order for sediments to become rock, the sediments are generally

An example of a grad-school level question?
The fur of an arctic fox turns from brown to white as winter approaches. This is an example of