What evidence shows the area that is now the Grand Canyon was under a sea several times? *igneous rock from volcanoessedimentary rock made of the shells of sea creaturesmetamorphic rocklayers of rock of different colors

sedimentary rock made of the shells of sea creatures

Explanation:

The examination of the sedimentary rocks on the Grand Canyon in the Grand Canyon National Park reveals that the age of this canyon is about 200 million old. These were found deposited in the warm and shallow seas. These were found in the western North America. The examination of the sedimentary rocks revealed that these were composed of the calcium shells of the sea animals.  

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.