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Across 4. Disorder or entropy tends to increase 6. Biological catalysts that speed up reactions 9. Energy of position or store energy 10. The sum total of all chemical reactions in the body 12. Requires input of energy 13. Creates complex molecules from simpler ones 14. Breaks down complex molecules into simpler ones 15. Energy of movement or energy of doing work 16. An example of a reaction that releases energy

Down 1. Describes how energy and matter interact 2. The portion of a biological system’s energy that can perform work when temperature and pressure are uniform throughout the system 3. Energy is neither created nor destroyed 5. The capacity to do work 7. An example of a reaction that requires energy 8. Releases energy and occurs spontaneously 11. Energy that is unavailable to do work