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12. The viral______________plays a role in attaching a virion to the host cell.

22. Describe the relationship between mutation, evolution, and natural selection.  Do these terms apply to individuals or populations?

26. Why is the immune response much faster after reinfection than after the initial infection?

15. Foreign particles circulating in the blood are filtered by the   

13. Which of the following is a barrier against pathogens provided by the skin?

55. Write the balanced equation for photosynthesis.

19. The humoral response depends on B and T helper cells

56. During the light reactions in photosynthesis,__________ is split to replace the lost electrons; splitting reaction forms____________.

11. Natural selection results from interactions between:

25. Explain the difference between micro and macroevolution.