This sign for "school" is an example of an arbitrary sign because

Which factors threaten the forests of north america?

Asl may be used regularly in which field?

On what political idea did president truman base the marshall plan? as economic aid increased in europe, the friendship of nations with the united states would increase. as peace throughout the world increased, the threat of another world war would decrease. as prosperity in europe increased, the threat of communism spreading would decrease. as the power of capitalism increased in europe, stalin's power in the soviet union would decrease.