The plural form of bioactivity; multiple instances of the ability of a substance to produce effects in living organisms.
From bio- (life) + activity (state of being active). Bioactivity emerged in the mid-20th century as biochemistry expanded to describe how compounds interact with biological systems.
This term became crucial in drug discovery—scientists realized that just because a chemical exists doesn't mean it does anything useful in your body, so they needed a word for 'does this actually affect living things?'
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