look at the activity series and select which two of the following reactions would happen on their own

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

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  

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )