1. E. Theory 2. A. Archaea 3. B. Rigor mortis 4. D. Social darwinism (Friday special) 5. D. Cosmic rays 6. A. Relatively high (Friday special) 7. D. The Yucatan Peninsula (Friday special) 8. C. Neutrons (Friday special) 9. E. All of the above may apply, depending on the circumstances 10. B. Osteoporosis 11. D. Dysfunction of the autoimmune system 12. B. 50,000 13. A. Wendell Johnson Stuttering Project 14. A. C4 metabolism (Friday special) 15. C. Low endurance 16. D. Glycogen 17. A. Nervous 18. D. Hydrophobic interactions 19. C. Hydrogen 20. B. Queen Victoria (Friday special) 21. D. Sarcoplasmic reticulum 22. D. Intelligent design 23. C. Haversian canals 24. D. An enzyme 25. B. Mitochondrial DNA 26. D. 4 27. B. More persistent than testosterone 28. C. Electrons 29. E. Calcium 30. C. Peer review 31. E. Myoglobin 32. D. Products 33. C. Myostatin 34. E. Arrival of human immigrants in Australia 35. A. Producing ATP, high-energy compounds (NADPH), and oxygen 36. B. Low levels of Carbon-13 (Friday special) 37. A. Sciatica 38. A. Electrons 39. A. Shin splints 40. C. Potassium 40/Argon 40 41. B. A natural resistance to obesity 42. A. Blood clot formation 43. E. Calcium 44. D. Carbon-hydrogen bonds 45. C. Ribosomes 46. C. Creatine phosphate 47. C. Cholesterol 48. A. Gout 49. A. Acetabulum of the femur 50. C. Oxygen