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As an adjective, obligate means "by necessity" (antonym ''facultative'') and is used mainly in biology in phrases such as: * Obligate aerobe, an organism that cannot survive without oxygen * Obligate anaerobe, an organism that cannot survive in the presence of oxygen * Obligate air-breather, a term used in fish physiology to describe those that respire entirely from the atmosphere * Obligage biped, Bipedalism designed to walk on two legs * Obligate carnivore, an organism dependent for survival on a diet of animal flesh. * Obligate hibernation, a state of inactivity in which some organisms survive conditions of insufficiently available resources. * Obligate intracellular parasite, a parasitic microorganism that cannot reproduce without entering a suitable host cell * Obligate parasite, a parasite that cannot reproduce without exploiting a suitable host * Obligate photoperiodic plant, a plant that requires sufficiently long or short nights before it initiates flowering, germination or similarly functions * Obligate symbionts, organisms that can only live together in a symbiosis ==See also== *Opportunism (Biology) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「obligate」の詳細全文を読む スポンサード リンク
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