Why is system of currency exchange necessary for international trade?

a. nearly all world currencies are worthless on the world market.
b. those buying goods on the world market only accepted in gold and silver.
c. most goods bought on the international market must be bought and paid for using united states dollars only.
d. there must be a way to pay for goods purchased from countries with different types of currencies due to nationalism.
you for any answer that you provide! : d

Read the passage from the caged bird the connotation of narrow in the passage creates a feeling of

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a study of twenty 4th grade classrooms in which researchers ask the schools to systematically vary the time of day reading is taught, and collect weekly assessments of reading comprehension for each child over a three-month period.the collection of data, by a playground designer hired by the superintendent of schools, about the physical dimensions of school playgrounds, presence of fencing, and the kinds of equipment currently provided.a feasibility study for implementing a year-round school program, focusing on economic issues such a facilities utilization and transportation costs.an analysis of aggregate data comparing statewide high school graduation rates provided by the state department of public instruction, using county tax information.

Aman and woman agreed to burn down a neighbor's house in retribution for some wrong the neighbor allegedly committed against them. both the man and woman were arrested shortly after they poured gasoline on the neighbor's front porch. the man revealed to the police that he participated in the plan to ensure that nothing bad would happen to the neighbor, and that he had made an anonymous telephone call to the police alerting them to the crime, which enabled the police to arrest him and the woman in the act. the woman stated that she would not have participated if not for the man's encouragement. if the woman is charged with a conspiracy at common law to commit arson, how should she be found?