Well, the cell membrane regulates what goes in and out of the cell, it all so helps to shape it along with the cell wall (animal cells do not have a cell wall.) So it’s like a guard for the cell.
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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. Carbon dioxide is produced by all cells as a result of cellular metabolic processes.
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Answer:
im pretty sure a mountain
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im like 95% sure but hey this is better than nothing