The California current is an ocean current that moves cold water from the north along the west coast of the United States. The main effect of this current is to make the climate of the west coast . A. warmer B. wetter C. cooler D. dryer

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.

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