Mention any three major differences between Porifera and Coelenterata.

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Porifera Coelenterata
$(i)$ They exhibit cellular level of organization. $(i)$ They exhibit tissue level of organization.
$(ii)$ Their body is diploblastic or lacks true tissue layers. $(ii)$ Their body is distinctly diploblastic with two layers of cells.
$(iii)$ They possess numerous pores (ostia) all over the body for water circulation. $(iii)$ They do not have pores all over the body; instead,they have a single opening called the hypostome.

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