The presence of mutable collagenous tissue is an important feature of :

Annelida

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Echinodermata

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Porifera

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Molluska

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Solution

The correct option is B Echinodermata
The correct answer is B
The echinoderms like starfish and sea-urchins contain mutable collagenous tissue which has the capacity to undergo reversible changes in their mechanical properties. it includes tensile strength, stiffness and viscosity.

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