Клеточная теория — основополагающая для общей биологии теория, сформулированная в середине XIX века. Она предоставила базу для понимания строения и развития организмов и для развития эволюционного учения. Маттиас Шлейден и Теодор Шванн сформулировали клеточную теорию, основываясь на множестве исследований о клетке (1838—1839). Рудольф Вирхов позднее (1858) дополнил её важнейшим положением (всякая клетка из клетки).
Шлейден и Шванн, обобщив имеющиеся знания о клетке, доказали, что клетка является основной единицей любого организма. Клетки животных, растений и бактерии имеют схожее строение. Позднее эти заключения стали основой для доказательства единства происхождения организмов. Т. Шванн и М. Шлейден ввели в науку основополагающее представление о клетке: вне клеток нет жизни.
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