What is a non-renewable resource?

a resource that is found in forests.

a resource that must be mined.

a resource that can be replenished faster than it runs out.

a resource that does not replenish itself faster than it is being used.

Explanation:

In effect, a non renewable resource is the last one, but no one would agree.

Something found in forests (like tree wood) is renewable.

Anything that can be replenished faster than it is used is renewable.

The answer you are looking for is the second one. Anything that is mined is not renewable. If you place a chunk of gold in a dark room and leave it there for a century, you will not find you have more gold when your return. Once you mine something, it's gone.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.