Organisms which live symbiotically inside a larger organism are known as:

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Endosymbionts are organisms that live symbiotically (usually mutually beneficial) inside another organism. Organelles such as mitochondria and chloroplasts were once endosymbiotic bacteria that were engulfed by a host cell and developed a mutually beneficial relationship. Cyanobacteria, while capable of mutualistic relationships, are not exclusively endosymbiotic organisms.

Organisms Which Live Symbiotically Inside a Larger Organism Are Known