Which of the following taxpayers (all age 40) are required to file a return? 
Definitions:
Species
An assembly of life forms made up of alike members that can interchange genes or mate with each other.
Microevolution
Evolutionary changes within a species or small group of organisms, particularly over a short period.
Genetic Changes
Alterations in the DNA sequence of an organism, which can affect its characteristics or behavior.
Population
The total number of individuals or organisms residing within a particular area or habitat.
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