Draw out the formation of the electrovalent bond of mgcl2

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.

Respiratory and cardiovascular diseaseor maybe your looking for the say 2.6 people die from