For a cell to maintain the appropriate balance of materials inside and outside of the cell, materials must be able to move in and out of the cell. the degree in which materials are able to flow freely through a cell's membrane is known as a. permeability. b. reabsorption. c. transpiration. d. oxidation.

The answer is; permeability

This is the property of a material to allow fluids to pass through them without being changed physically or chemically. The membrane of the cell is referred to as semi-permeable because it allows only particular fluid through it depending on the pore size of the cell membrane. Particles that are larger in size can only be taken up by active transport such as by endocytosis.