obligate
In biology, able to exist or thrive only under a certain set of environmental conditions, e.g., an obligate peat swamp-dweller.
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Results for “obligate”
Ichthyological terms, not general ones.
symbiosis
Close, long-term association between two different biological species. Often obligatory and often, though not always, with a mutual benefit for both organisms.
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troglobite
Obligate dweller of caves or underground environments.