The Appalachian Highland is the (smallest highest lowest)
location in the Mid-Atlantic region.

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.

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.