Answer: Economic means relating to economics or the economy.
Opportunity cost means: The loss of potential gain from other alternatives when one alternative is chose
Scarcity means: The state of being scarce or in short or in short supply; shortage
Demand: an insistent and peremptory request, made as if by right
Supply: make something needled Ir wantsd available to someone;provided
Explanation:
Of the choices provided the correct one is A. When the Sahara began to dry out the people looked for water.
Depends how you define nature.
The solar system is made by nature.(the big bang)
Mountains are made by nature (movement of the plates everything is located on)
Vulcanos (eruptions spit up all the earth and made these mountain like structures