After most of the iron in the ocean was trapped in banded iron began dispersing into the atmosphere.

Oxygen began dispersing into the atmosphere.

Answer. first blank ; ; ; clockwise; the second blank; ///clockwise;

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.