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Facultative

Facultative means 'optional' or 'discretionary' (antonym obligate), used mainly in biology in phrases such as: Facultative means 'optional' or 'discretionary' (antonym obligate), used mainly in biology in phrases such as:

[ "Bacteria", "Ecology", "Botany", "Paleontology", "Bacillus flavothermus", "Methylotroph", "Pink-Pigmented Facultative Methylotrophs", "Nes longus", "Trichotropis cancellata" ]
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