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B
Archaeocytes
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C
Thesocytes
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D
Amoebocytes
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Solution
The correct option is A Sclerocytes Poriferans are commonly known as sponges. They are multicellular organisms with cellular level of organization. They are sessile and sedentary in nature. These have an exoskeleton made up of either spongin fibers or calcareous or siliceous spicules. The spicules form the skeleton of the body which provides protection. These spicules are formed by sclerocyte cells present in the mesenchyme