For most of human history, humans were:

Resources that can be used over and over

People started farming 10,000 years ago. This was the:

Resources that cannot be replaced like fossil fuels

Any substance that living things use

Everything that surrounds us

When a species dies and is gone forever it is:

About 300 years ago people started using fossil fuels to power their labor. This was called the:

Growing crops and caring for domesticated animals is called:

Earth is a ____ system.

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