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Watch Later 3:38

Biological Concept-Ch.8 (8) - Comparing between Artery and Veins

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Biological Concept-Ch.8 (7) - Veins

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Biological Concept-Ch.8 (6) -Arteries

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Biological Concept-Ch.8 (5) -Blood vessels

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Biological Concept-Ch.8 (4) -Blood diseases

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Biological Concept-Ch.8 (3) -The Function of blood

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Biological Concept-Ch.8 (2) -The Composition of blood

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Biological Concept-Ch.8 (1) -Transport system

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Biological Concept-Ch.7 (19) - Model of ventilation

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