What is a map projection and why is it hard to depict the earth on a flat surface accurately?

Answer steam fog;

Answerair masses develop near the equator are warm; tropical air mass

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.