Homeostasis 5.0 / 5 based on 4 ratings ? BiologyHuman, animal and plant behaviourA2/A-levelWJEC Created by: Carys WaltersCreated on: 09-12-14 23:18 3241 Across 1. When in the loop of henle is the filtrate most concentrated? (2, 3, 4) Down 2. What is the excretory substance of birds? (4, 4) 3. What is the excretory substance of fish? (7) 4. What is the excretory substance of mammals? (4)
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