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a
absence of mesoderm.
b
sexual dimorphism.
c
true metamerism.
d
absence of body cavity.
answer is D.
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Detailed Solution
Planaria belongs to Platyhelminthes. It is a triploblastic (has three germ layers - ectoderm, mesoderm and endoderm) acoelomate (without body cavity). It is unsegmented and does not exhibit metamerism It is hermaphroditic and hence there is no sexual dimorphism.