Choose the correct statement with respect to certain features in the animals

Options

A. All mammals are viviparous
B. All cyclostomes do not possess jaws and paired fins
C. All reptiles have a three-chambered heart
D. All Pisces have gills covered by an operculum

Answer

B

Explanation

Cyclostomata is a class belonging to section 1-Agnatha of subphylum-Vertebrata.
It is a paraphytelic superclass of jawless fishes. They lack paired fins too. Thus option (b) is correct.