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Transportation of substances across bryophyte tissues

How transport of substances is done across the bryophyte tissues? How this characteristic is associated with the general size of these plants?

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Within the bryophytes, there exist no water-conducting or nutrient-conducting structures and transport of these substances is done through cell to cell diffusion. Small size of the bryophytes is related to this feature as if there is no conductive vessels it is not viable to have cells too far from each other (emergence of conductive tissues within tracheophytes permitted their increase in the size).

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