Which one of the following categories of anim | vedclass

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(B) The correct answer is $B$.$A$: Incorrect. Reptiles like crocodiles have a $4$-chambered heart.$B$: Correct. All bony fishes (Osteichthyes) possess

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All bony fishes have four pairs of gills and an operculum on each side.

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(B) The correct answer is $B$.$A$: Incorrect. Reptiles like crocodiles have a $4$-chambered heart.$B$: Correct. All bony fishes (Osteichthyes) possess $4$ pairs of gills covered by an operculum on each side.$C$: Incorrect. While most sponges are marine,some like $Spongilla$ are freshwater.$D$: Incorrect. Most mammals are viviparous,but monotremes like $Ornithorhynchus$ (platypus) are oviparous (egg-laying).

Which one of the following categories of animals is correctly described with no single exception?

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