Which of the following represents the correct | vedclass

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(A) Option $A$ is correct because Chondrichthyes (cartilaginous fishes) possess a ventral mouth,gills without operculum,placoid scales,and a persisten

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Mouth ventral,gills without operculum,skin with placoid scales,persistent notochord - Chondrichthyes

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(A) Option $A$ is correct because Chondrichthyes (cartilaginous fishes) possess a ventral mouth,gills without operculum,placoid scales,and a persistent notochord throughout life.Option $B$ is incorrect because Cyclostomata lack paired appendages.Option $C$ is incorrect because the skin of Aves is dry and non-glandular (except for the oil gland at the base of the tail).Option $D$ is incorrect because while most mammals have pinnae and two pairs of limbs,some mammals like whales (Cetacea) lack pinnae and hind limbs,making it not an exception-less rule.

Which of the following represents the correct combination without any exception?
Characteristics - Class

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Which of the following represents the correct combination without any exception?Characteristics - Class