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Cross-sectional studies compare different age groups at the same time.
Mass
A measure of the amount of matter in an object, typically in kilograms or grams, independent of its volume or any forces acting on it.
Mole
A basic unit of measure in chemistry that represents a quantity of chemical substance containing approximately 6.022 x 10^23 particles, atoms, molecules, ions or electrons.
Silver
A precious metal with the chemical symbol Ag and atomic number 47, known for its conductivity and antibacterial properties.
Mass
A property of physical matter which determines the strength of its mutual gravitational attraction to other bodies and its resistance to being accelerated by a force.
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