1. Tardigrade
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  3. Biology
  4. Ambulacral grooves are absent in the living forms of the class:

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Q. Ambulacral grooves are absent in the living forms of the class:

EAMCETEAMCET 1996

Solution:

Ambulacral grooves arise from the five corners of the peristome. These extend along the middle of the oral surface of each arm upto its tip. In Ophiuroidea these are absent