Four students have done a nice job drawing membrane models. Which model does the best job of showing osmosis? a. Thomas. Student-drawn membrane model within a rectangular box. From left to right there is an upper and lower line spaced moderately apart. b. Three identical structures are dispersed across the lines consisting of a left and right apple-wedge shape with their flat ends facing across a narrow gap. c. Numerous orange dots fill the box above the structure, and three orange down-arrows are centered within each of the three gaps. d. The arrows start in the box near the orange dots and end in the space beneath the structure.