Consider the following structures I-IV.Which two species represent resonance structures? 
Definitions:
Direct Election
A method of choosing political officials where the voters directly cast ballots for the persons or political party that they desire to see elected.
Marbury v. Madison
A landmark Supreme Court case in 1803 that established the principle of judicial review, allowing courts to declare laws unconstitutional.
Articles of Confederation
The original constitution of the United States, ratified in 1781, which was replaced by the current Constitution in 1789 due to its weaknesses.
Federal Court System
The judiciary system of the United States, consisting of the Supreme Court, appellate courts, and district courts.
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