Closed ciculatory system is not seen in
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The circulatory system varies from simple systems in invertebrates to more complex systems in vertebrates. The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases.
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Answer: Sponges (Porifera) and rotifers
Explanation: Open Circulatory System is a simple circulatory systems in invertebrates , they have open circulatory system because diffusion allows adequate exchange of water, nutrients, and waste.
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