why ascaris said to have a tube within a tube body plan ?
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tube within tube body plane simply mean to copmlete digestive system...
now u hv understood it..
now u hv understood it..
zahrah:
yes boss
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It refers to the development of a fluid-filled cavity between the outer body wall and the digestive tube. The nature of this body cavity has led to the grouping of metazoa into three grades, acoelomate, pseudocoelomate, and eucoelomate
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