Which Element Is Not Essential for Human Life

question 68

Multiple Choice

Which element is not essential for human life?

• A)C
• B)H
• C)P
• D)Pb
• E)Ca

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Definitions:

Age Distribution

The frequency of different ages or age groups in a given population.

Estimate

A value calculated from sample data that is used to indicate the value of a population parameter.

Proportion

A statistical measure that represents the fraction of the total number of objects in a particular category relative to the total number of objects in all categories.

Observational Study

A type of study where researchers observe subjects in their natural environment without manipulating variables.