The lifestyle or ecological relationship where an organism lives as a parasite inside another organism.
From endoparasite + '-ism' (denoting a state, condition, or system). This abstract noun captures not just the organism but the entire ecological strategy.
Endoparasitism is like the ultimate evolutionary guerrilla warfare—parasites that mastered living inside hosts basically hacked the survival system by exploiting a resource-rich environment. Many diseases we fear are just sophisticated versions of this ancient arms race.
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