| Porifera | Coelenterata |
|---|---|
| They are mostly marine, non-motile, and found attached to rocks. | They are aquatic, mostly marine, and can be sessile or free-swimming. |
| They exhibit a cellular level of organization. | They exhibit a tissue level of organization. |
| The body has pores (ostia) and a central cavity called spongocoel. | The body has a central gastrovascular cavity with a single opening called the hypostome. |
| Examples: $Spongilla$, $Euplectella$, $Sycon$. | Examples: $Hydra$, $Sea \text{ } anemone$, $Corals$. |
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