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M. J. Schleiden shifted the scientific community’s attention to cellular processes with his (4 points) a attention to disproving spontaneous generation b publication of ideas on cell generation c theories on the division of cells d claim that cells were the basic unit of all plant matter

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Spontaneous generation, the hypothetical process by which living organisms evolve from inanimate matter; also, the ancient theory that used this process to explain the origin of life. Many believed in spontaneous generation because it interpreted events as maggots appearing on rotting flesh. Spontaneous generation is the hypothesis that some vital force contained in organic matter or imparted to living organisms can create living organisms from inanimate objects. Spontaneous generation was widely believed throughout the Middle Ages and into the second half of the 19th century. Rejection of spontaneous generation is no longer controversial among biologists. By the mid – 19th century, the experiments of Louis Pasteur and others contradicted the traditional theory of spontaneous generation and supported biogenesis.

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