B3.1 0.0 / 5 ? BiologyGCSEAQA Created by: RebekahCreated on: 11-05-13 14:58 23145 Across 1. The movement of substances from an area of low concentration to high concentration against a concentration gradient, using energy (6, 9) 5. The exchange surface of the gut/small intestine (5) Down 2. The holes on the bottom of a leaf (7) 3. The exchange surface of the lungs (7) 4. The movement of water molecules from an area of high concentration to an area of low concentration down a concentration gradient (7)
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