A) triploblastic body
B) solid mesodenn
C) bilateral symmetry
D) metamorphosis in the life history
Correct Answer: B
Solution :
Flat worms (Platyhelminthes) and roundworms achelminthes) both possess triploblastic body bilateral symmetry and metamorphosis in the life history. But flat worms differ from all roundworms in having solid mesoderm. The mesodermally derived tissue includes a loose tissue called parenchyma and this tissue fills the body space, ie, space between the body wall and more specialised tissue or organs.
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