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Sponges do not have body cavity.
They are sedimentary, attached to substratum.
They have pores all throughout their body.
examples include. sycon , sporangium, eurosporangia.,, etc.
Echinoderms have spiny exoskeleton.
They are radially symmetrical.
They have coelom.
Examples include sea anemone, star fish,sea urchin, etc.
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