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Which of the following could be a proximate explanation for the behavior of singing in birds?
Purchasing Power
An individual's or entity's ability to buy goods and services, affected by inflation and personal financial situation.
Hourly Rate
The sum of money received or given out for every hour worked.
Toxic Waste Discharge
The release of harmful pollutants into the environment, usually from industrial operations.
Stringent Restrictions
Strict or severe limitations or rules that must be followed.
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