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Why is diffusion insufficient to meet oxygen requirements of multicellular organisms like humans?
What are the components of the transport system in human beings? What are the functions of these components?
Compare the structural features of arteries and veins.
Explain how these differences are related to their functions in the given picture.
Identify any two parts from the diagram given which carry oxygenated and deoxygenated blood.
Explain the process of double circulation with the help of a flow chart
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