Determine whether each of the following graphs has an Euler circuit. If it does have an Euler circuit, find such a circuit. If it does not have an Euler circuit, explain why you can be 100% sure that it does not. 
Definitions:
Population Size
The total number of individuals or inhabitants in a specified area or group.
Emigration
Or out-migration, is the outflow of people from one country and their settlement in one or more other countries.
Immigration
Or in-migration, is the inflow of people into one country from one or more other countries and their settlement in the destination country.
Overpopulation
A condition where the number of individuals exceeds the carrying capacity of their habitat, leading to environmental and social issues.
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