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Other means for transport of substances in animals

What is the other means for transport of substances in animals devoid of a circulatory system? Why is blood significant for bigger animals?

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The animals which do not have the circulatory system, transportation of substances takes place by cell to cell diffusion.

The blood is a basic means of substance transport for bigger animals as in such animals there are tissues distant from one other and from the atmosphere therefore making diffusion not possible.

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