The answer to this question is A. Jet streams
Jet streams are located near the altitude of the upper troposphere. It's a movement of wind that travels from one side of the planet hemisphere to another. The movement of jet streams will bring up different temperature of air which could influence the weather that exist in certain regions.
Your left foot should be on the clutch pedal while your right foot should be on the gas pedal
A: perestroika means openness thus meaning the people were allowed to be open about how they felt
C.) trial by jury of peers
It did complex calculations needed to fire artillery!