Why is a 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 accept payment 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

The answer would be D.

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well, paralell is parallel. i am providing links to .

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a series circuit is one with all the loads in a row. there is only one path for the electricity to flow. if this circuit was a string of light bulbs, and one blew out, the remaining bulbs would turn off.

unlike in series circuits, a charge in a parallel circuit encounters a single voltage drop during its path through the external circuit. the current through a given branch can be predicted using the ohm's law equation and the voltage drop across the resistor and the resistance of the resistor.

a parallel circuit has certain characteristics and basic rules: a parallel circuit has two or more paths for current to flow through. voltage is the same across each component of the parallel circuit.

the first part is ocean

explanation: