The population of a school is 3718, approximate this to the nearest hundred

Tropical climate is experienced in the nothern countries of south america

Answerland;

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.