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The most natural concept of the individuality of a sponge, based upon morphological and physiological aspects is
(a)Ostia and canal system
(b)Ostia, osculum and canal system
(c)Ostia and diploplastic body
(d)Osculum and choanocytes

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Important Questions on Animal Kingdom
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I. Some absorbs nutrients from the host directly through their body surface.
II. Digestive system (if any) incomplete, branched and without anus.
III. Flame cells/solenocytes/protonephridia help in excretion and osmoregulation.
IV. Hooks and suckers are present in parasitic forms.
V. Hermaphrodites (usually).
VI. Fertilization internal.
VII.Indirect development (usually) through many larval stages.

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