The U. S. was the only combatant country involved in WWI whose economy benefited from the war. *
-True
-False

True

Explanation:

The experience of World War I had a major impact on US domestic politics, culture, and society. ... Countries that were allied with the Central Powers are highlighted in orange. ... [See a list of principal World War I combatants] ... outbreaks of violence against groups whose loyalty to the United States was considered suspect.

food chain i would say only because there is competition on getting food and survival

the answer would be a).