41. It is a facultative anaerobe, it can therefore use alcoholic respiration in aerobic conditions. 42. Fish can be obligate or facultative shoalers. 43. Proposition 7 introduced a form of optional ( or facultative ) referendum on ordinary statutes. 44. Abundant evidence indicates that facultative sexual eukaryotes tend to undergo sexual reproduction under stressful conditions. 45. "Victavallis vadensis " is a facultative anaerobe, like most gut microbes. 46. Following fire it is a facultative resprouter sending up an epicormic sprout from its lignotuber. 47. It is a lethal facultative parasite of the terrestrial gastropods ( slugs and snails ). 48. These are known as facultative saprotrophs. 49. Such species are considered facultative freshwater cetaceans as they can use both marine and freshwater environments. 50. Tobacco hornworms are facultative specialists; the larvae can grow and develop on any host plants.
