What did the Curies demonstrate by studying pitchblende? Uranium is not the only radioactive element.
All elements are potentially radioactive.
Radium can cause anemia, bone and tissue damage, and death.
Uranium salts emit something that can expose photographic film.

it should be all of them because it asks if you included all of those in your answer

explanation:

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

answer carbon and three oxygen atoms;