Examlex
_____ usually occurs when participants who form the two groups in an experiment are chosen from existing natural groups.
Osteoporosis
A condition characterized by weakened bones that are more prone to fracture.
Riboflavin
A B vitamin (B2) essential for energy production and cellular function, found in foods and supplements.
Magenta
A color that is a combination of red and blue light, often described as a deep purplish-red.
Vitamin
Essential organic compounds that organisms need in small amounts for proper health and functioning.
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