Consider the following structures I-IV.Which two species represent resonance structures? 
Definitions:
Unemployment Rate
The proportion of the employable population that is not working but actively looking for work.
Recovery Phase
A stage of the economic cycle where activity starts increasing again after a downturn, leading to higher employment and output levels.
Business Cycle
The progression of economic activity through expansion, peak, contraction, and trough phases.
Business Cycle
The natural fluctuation of the economy between periods of expansion (growth) and contraction (recession).
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