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B
Epidermis and gastrodermis
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C
Having smooth muscle fibres in mesoglea
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D
All of the above
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Solution
The correct option is D Having smooth muscle fibres in mesoglea Mesoglea is also known as mesohyl. It is the translucent, non-living, jelly-like substance found between the two epithelial cell layers in the bodies of cnidarians and sponges. The mesoglea of ctenophora is more specialised than cnidarians. Ctenophores contain smooth muscle fibres in the mesoglea.