A local congressperson is a member of the Legislative branch in a government. A congressperson is someone who was elected to and a member of an official body, the congress, who's main and important responsibility is to makes a law.
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<em>Ontology is the branch of philosophy that studies concepts such as existence, being, becoming, and reality. It includes the questions of how entities are grouped into basic categories and which of these entities exist on the most fundamental level.</em>