What is an essential element of an open class system?

answer; traffic,pedestrians,parked vehicles and intersections;

for the full pic, im also im american school, and my picture was glitched

in order to keep competitors from increasing or decreasing the prices they may establish, usa in the period of 70s set very democratic price - abut 1 dollar per gasoline so that their offer will be more affordable and attractive.

they are the same thing, it's about what you identify as (ex: heterosexual, bisexual, homosexual etc.) and who you are romantically attracted to.