The middle layer in body wall of porifera is

Mesoderm

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Mesenchyme

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Mesentery

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None of the above

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Solution

The correct option is A Mesenchyme
Poriferans are diploblastic animals. They have two germ layers ectoderm and endoderm. Mesoderm is absent in poriferans. The ectoderm is the outer pinacoderm and endoderm is the inner choanoderm with a noncellular, nonliving mesoglea or mesenchyme in between.
So, the correct answer is option B.

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