The phenomenon of two or more variables changing together in a related or coordinated pattern over time or across observations.
From 'co-' (together) + 'variation' (from Latin 'variare,' to change) + '-tion' (noun suffix). A systematic term for describing synchronized changes in multiple variables.
Birds' wing size and body weight show covariation—larger birds have proportionally larger wings, a relationship that persists across every flying species, showing nature follows mathematical rules.
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