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  1. Blood - Wikipedia

  2. Blood - American Society of Hematology

  3. Blood: Function, What It Is & Why We Need It - Cleveland Clinic

  4. Blood | Definition, Composition, & Functions | Britannica

  5. Facts About Blood - Johns Hopkins Medicine

  6. Blood: Components, functions, groups, and disorders

  7. Blood - MedlinePlus

  8. Blood (Anatomy): Function, Components, Types... | Biology ...

  9. In brief: What does blood do? - InformedHealth.org - NCBI ...

  10. Quick Facts:Overview of Blood - MSD Manual Consumer Version