plant cover provided food and protection for organisms riparian zone-buffers water ... The Frejelón is an species, found nowhere else on earth. endangered. From quizlet
Answer: 15.4 g C/m^2/day
Explanation: NPP = GPP (22) - Ra (6.6)
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.