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the most efficient way to ensure that producers are responsible for products is through

advertising
legislation.
labeling
compliance

Great Question!

The most efficient way to ensure that producers are responsible for products is through labeling

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.