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What type of sample includes individuals who are not selected strictly by chance from the universe of interest?
Carbon
A chemical element with the symbol C and atomic number 6, essential for all life, known for its ability to form a vast number of compounds.
Hydrogen
The lightest and most abundant chemical element in the universe, consisting of a single proton with one electron, often used in fuel cells and various industrial processes.
Mercury
A chemical element with the symbol Hg and atomic number 80, known as quicksilver; a heavy, silvery d-block element that is liquid at room temperature.
Helium
A colorless, odorless, tasteless, inert gas that is the second lightest element and found in abundance in the universe.
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