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In animals that lack a circulatory system, how are materials transported? | HIX Tutor

<p>In simple organisms, their bodies have only single cell layer. In them, the materials are transported by simple cell to cell diffusion process. This is found in  platyhelminthes(flatworms), porifera and cnidaria and some invertebrates </p>

Connor Abernathy

In animals that lack a circulatory system, materials are transported through diffusion across cell membranes.