The history of average global temperature for the last 160,000 years is derived from isotopic analysis of ice layers in Antarctica. Scientists study the ratio in .

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.

Adrought is taking place