Which of the following is pseudocoelomate animal (and why) :
(a) Whip-worm
(b) Sand-worm
(c) Flat-worm
(d) Tape worm
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"Flat worms" are pseudocoelomate animal.
The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa, Nemertina, Gnathostomulida. Pseudocoelomate animals have a pseudocoelom. They have a body cavity but it is not lined with mesodermal cells. It exists between the mesoderm and the endoderm that makes up the walls of the gut.
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