4. physical properties of minerals - hardness, streak, color, cleavage, fracture, etc. why is color not a good mineral indicator property (by itself)?

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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.