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B
Astomia
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C
Protostomia
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D
Blastostomia
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Solution
The correct option is A Deuterostomia The enterocoelom arises from the wall of the embryonic gut as a hollow outgrowth and it expands and lines both the inner side of the gut and the outer side of the body wall by mesoderm e.g.,echinodermata, chordates. Both echinoderms and chordates are deuterostomes.