Explanation:
85% efficiency of simple machine means that with 100% input, the machine will give a work output of 85%. EXPLANATION: The efficiency of a machine is the ratio of its Mechanical Advantage to its Velocity
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The two cell layers being referred from the question are a layer of alveolar cells and layer of endothelial cells. Gases must diffuse to these layers to proceed to the plasma. The layer of alveolar cells make up the alveolar wall while the layer endothelial cells consist the capillary wall.
Its letter A or D, sorry if I’m wrong