Most of the sponges are

Fresh water forms

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solitary

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Colonial

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cold water inhabitants

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Solution

The correct option is A
Fresh water forms

Poriferans are commonly called sponges. These are multicellular organisms which are sessile/sedentary in nature. Most of them are marine while a few are freshwater forms. Symmetry is cylindrical, asymmetrical or has radial body. Presence of choanocytes is one of the distinctive characteristics of Porifera.

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