The United States began as more of a

market economy but grew more mixed as government added laws and regulations

Explanation:

answer; the correct answer is (ethics);

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.