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Facultative
Facultative means "optional" or "discretionary" (antonym ''obligate''), used mainly in biology in phrases such as: * Facultative anaerobe, an organism that can use oxygen but also has anaerobic methods of energy production. It can survive in either environment * Facultative biped, an animal that is capable of walking or running on two legs as well as walking or running on four limbs or more, as appropriate * Facultative carnivore, a carnivore that does not depend solely on animal flesh for food but also can subsist on non-animal food. Compare this with the term omnivore * Facultative heterochromatin, tightly packed but non-repetitive DNA in the form of Heterochromatin, but which can lose its condensed structure and become transcriptionally active * Facultative lagoon, a type of stabilization pond used in biological treatment of industrial and domestic wastewater * Facultative parasite, a parasite that can complete its life cycle without depending on a host * Facultative photoperiodic plant, a plant that will eventually flower regardless of night length but is more likely to flower under appropriate light conditions. ==See also==
*(antonym) Obligate *Opportunism (Biology)
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