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When estimating a population mean, the degrees of freedom, df, is:
Humans
A species of bipedal primates belonging to the genus Homo, particularly Homo sapiens, characterized by advanced cognitive abilities.
Explosive Radiation
Rapid evolutionary diversification within a lineage, resulting in the formation of many new species.
Birds
Warm-blooded, feathered vertebrates that lay eggs, characterized by their ability to fly, although some species are flightless.
Adaptations
The process by which organisms adjust to changes in their environment, often leading to evolutionary changes that improve survival and reproduction.
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