Economic important of continental shelf

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.

answer; /// i believe the correct answer is general act charters;

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska