Why do multicellular animals need a circulatory system
i) Why do multicellular animals need a circulatory system?
ii) Fluid pressure is very low in the veins. Explain how bloodgets back to the heart.
iii) What do fat deposits in arteries cause and why is this dangerous?
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Why do multicellular animals need a circulatory system, Fluid pressure is very low in the veins. Explain how bloodgets back to the heart
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