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The hydrogen in an HII region is
Central Person
An individual who plays a pivotal or core role within a group, network, or organization, often influencing decisions and outcomes.
Relationship
A connection, association, or involvement between two or more entities, individuals, or concepts, based on interaction, kinship, or shared characteristics.
Class Position
An individual's or group's status within a society's hierarchy, often related to occupation, wealth, and education.
Change
The process through which something becomes different in some particular way, without permanently losing its identity.
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