Question

fill in the blank question
cell membranes can regulate the transport of materials into and out of the cell. thus, cell membranes are said to be □ permeable.
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Explanation:

Cell membranes selectively allow certain substances to pass while restricting others, so they are described as selectively (or semi -) permeable. The key concept here is the property of cell membranes to regulate material transport, which is known as selective permeability (or semi - permeability).

Answer:

selectively (or semi -)