What brought about the Red Scare in American in 1919-1920 ? Americans feared the rise of communism in America

The Russians were threatening a nuclear attack on America.

The western states were experiencing a terrible drought.

Americans were worried because lawmakers wanted to remove the color red from our flag.

Answer// dinosaurs emerged during mesozoic era;

Answerwill have thinner; have thicker oceanic sediments;

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.