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Crocodile and penguin are similar to whale and dogfish in which one of the following features?
(a)Possess bony skeleton
(b)Lay eggs and guard them till they hatch
(c)Have gill slits at some stage
(d)Possess a single solid nerve cord

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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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