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    • REPRODUCTION - Duration: 52 seconds.

      • 1,199,124 views
      • 9 years ago
    • DIGESTION - Duration: 50 seconds.

      • 46,585 views
      • 9 years ago
    • RESPIRATION - Duration: 57 seconds.

      • 26,887 views
      • 9 years ago
    • CIRCULATION - Duration: 68 seconds.

      • 1,341,532 views
      • 9 years ago
    • INFECTION FIGHTERS - Duration: 69 seconds.

      • 36,397 views
      • 9 years ago
    • SMELLING AND TASTING - Duration: 53 seconds.

      • 86,113 views
      • 9 years ago
    • HEARING & Balance - Duration: 63 seconds.

      • 100,912 views
      • 9 years ago
    • SEEING - Duration: 59 seconds.

      • 10,658 views
      • 9 years ago
    • Locomotion - Duration: 59 seconds.

      • 40,726 views
      • 9 years ago
    • SKIN, HAIR, AND NAILS - Duration: 72 seconds.

      • 126,502 views
      • 9 years ago
    • Hormones - Duration: 63 seconds.

      • 270,319 views
      • 9 years ago
    • Nervous system - Duration: 51 seconds.

      • 310,659 views
      • 9 years ago
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