caption: The image shows a diagram of a piece of paper with a line drawn on it, which is a drawing of a carbonate and ocalic membrane. The paper is white in color and the diagram is composed of two lines, one labeled "carbonate" and the other labeled "ocalic". The lines are drawn in black ink and are connected to each other by a thin black line. The diagram is labeled with the names of the components of the membrane, such as the carbonate layer, the ocalico layer, and the carbon dioxide layer.