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Spicules made of silica are found in:
(a)Leucosolenia
(b)Sycon
(c)Hyalonema
(d)Grantia

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Important Questions on Animal Diversity - I (Invertebrate Phyla)
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Termites cannot digest cellulose of wood in the absence of

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The nature of the cyst wall of Euglena is

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The dorsal side of the skin of Pheretima is brown due to

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The function of blood glands in Pheretima is

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Spermatophores of Pheretima are formed due to the secretions of

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The ova of Pheretima are released through a pore present on the

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External segmentation is absent in one of the following annelids

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Reduced, functionless mandibles are present in
