Functional systems for specific physiological functions are not seen in
A
Annelids
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B
Molluscs
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C
Arthropods
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D
Echinoderms
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E
Coelenterates
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Solution
The correct option is E Coelenterates
Functional systems for specific physiological functions are not seen in coelenterates because of the absence of organ system level of body organisation. They have tissue grade system of organization.