Question

as human populations increase, more shelter is needed. increasing shelter often requires making a trade - off with another resource. which resource decreased to increase a shelter resource?
a. farmland is converted into house lots.
b. old - growth timber is cut to build houses.
c. corn is made into ethanol for cars instead of food.
d. wind power generated on farmland provides electricity for a factory.

Explanation:

To solve this, we analyze each option for a trade - off related to shelter:

• Option A: Converting farmland (a resource for food production) into house lots (for shelter) shows a trade - off. Farmland (a non - shelter resource) decreases to increase shelter (house lots).
• Option B: Cutting old - growth timber for houses is using a resource for shelter, but it's not a decrease of a non - shelter resource to increase shelter in the same way as A. Timber is a building material for shelter, not a distinct non - shelter resource being traded off.
• Option C: Corn for ethanol instead of food is a trade - off for fuel vs food, not related to shelter.
• Option D: Wind power on farmland for factory electricity is a trade - off for energy vs farmland use, not related to shelter.

Answer:

A. Farmland is converted into house lots.