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True muscle tissue first appears in

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Important Questions on Animal Diversity - I (Invertebrate Phyla)

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In flatworms, the space between the body wall and gut is filled with
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Mesenchyma or parenchyma of flatworms is derived from
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Organs and organ-system level of body organisation first appeared in
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In flatworms, excretion is performed by specialized cells called
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Osmoregulatory structures of flatworms are called
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The muscles present in the body wall of nematodes are