Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 2. molecules move from high values of this 3. The maintenance of a constant internal environment; 5. These are broken down into urea 6. The process of movement of molecules from high to low concentrations 8. This needs to be partially permeable to allow molecules to pass through it 9. The substance which moves in osmosis 12. Urea is produced here

Down: 1. This needs to be set for optimum activity of enzymes 4. The organ where urea goes to be excreted in the urine 7. A protein which speeds up chemical reactions 10. This waste needs to be removed from cells 11. These need a constant supply of food and oxygen