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Reference.org
Non-cellular life
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<p>Non-cellular life, also known as acellular life, is <a href="/facts/Life/DNw7NUId">life</a> that exists without a <a href="/facts/Cell_(biology)/bLM9UQvy">cellular</a> structure for at least part of its <a href="/facts/Biological_life_cycle/1y28aNGG">life cycle</a>. Historically, most <a href="/facts/Life/DNw7NUId">definitions of life</a> postulated that an <a href="/facts/Organism/j8JkL09u">organism</a> must be composed of one or more cells, but, for some, this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements. </p>