Question

which statement best describes the role of the cell membrane? the membrane allows cytoplasm to flow freely between the inside of the cell and the cells environment in order to release wastes. the membrane acts as a skin for the cell, keeping all materials from the external environment out of the cell. the membrane separates the internal and external environment and controls the flow of materials into and out of the cell. the membrane is a solid structure that acts as an external skeleton for the cell, providing rigidity and protection.

Explanation:

The cell - membrane is a semi - permeable structure. It separates the cell's internal environment from the external one and controls the movement of substances like nutrients, ions, and waste products in and out of the cell. It is not a solid external skeleton, nor does it allow cytoplasm to flow freely between the cell and its environment, and it is not completely impermeable to external materials.

Answer:

The membrane separates the internal and external environment and controls the flow of materials into and out of the cell.