What quantity is conserved in the following reaction? 
Definitions:
The Red Cross
An international humanitarian organization providing emergency assistance, disaster relief, and education in communities affected by natural disasters and conflicts.
Expropriation
A government’s seizure of assets as a result of political action.
Repatriation
The process of returning an individual to their country of origin or citizenship, often used in the context of employees returning from international assignments.
Immigration
The action of coming to live permanently in a foreign country, often for reasons such as employment, better quality of life, or political asylum.
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