What is the key characteristic of an oxidation–reduction reaction?

a. electricity is gained.

b. electricity is lost.

c. electrons are exchanged.

d. electrons are gained.

e. electrons are lost.

The key  characteristic  of oxidation-  reduction   reaction  is electrons   are  exchanged  ( answer  C)

   Explanation

Example  of oxidation - reduction  reaction is

  CH4  +2O2 →   CO2  + 2H2O

  from reaction above C  atom  is oxidized  from  oxidation state -4  to 4.

   On the  other hand O atoms   are reduced  from oxidation state of 0 to  2-.  therefore   there is exchange  of electrons  between  C atoms  and O atoms.

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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