Across
- 7. The maintenance of stable internal conditions in the body
- 8. Single-celled microorganisms, some harmful, some helpful
- 9. Waste gas produced during respiration
- 11. Body response causing redness, swelling, and heat
- 13. Foreign substance that triggers an immune response
- 15. The main energy molecule used by cells
- 17. A trait that increases survival and reproductive success
- 18. A change in DNA that can create new traits
- 19. Differences among individuals in a population
- 21. Medicines used to kill or stop bacterial infections
Down
- 1. Energy production using oxygen
- 2. System that transports oxygen, nutrients, and wastes
- 3. Movement of molecules from high to low concentration
- 4. A disease-causing organism
- 5. Energy production without oxygen (produces lactic acid)
- 6. Main energy source for cells
- 10. Body system that defends against pathogens
- 12. Ability of bacteria to survive antibiotic treatment
- 14. Waste product formed during anaerobic respiration
- 16. Protein produced by white blood cells to fight antigens
- 20. Tiny air sacs in the lungs where gas exchange occurs