Examlex
Which of the following best describes the situation of serfs in Europe during the Middle Ages?
Nonrenewable Natural Resources
Natural resources that do not replenish at a sustainable rate within a human lifetime, such as fossil fuels, minerals, and metals.
Productive Inputs
The resources used in the production of goods and services, including labor, capital, and raw materials.
Biodiesel
A renewable, bio-based fuel that is produced from vegetable oils, animal fats, or recycled greases, suitable for use in diesel engines.
Economically Viable
A state or condition in which an activity or entity is capable of generating enough income to cover its expenses, sustainably over time.
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