Q.21 in a cell transportation of materials cours by
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Cells and Diffusion
Water moves through membranes by a type of diffusion known as osmosis. Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane. Gas exchange in gills and lungs operates by this process.
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The transportation is done by Endoplasmic Reticulum in a cell.
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