Choose the correct statement.
(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
Correct option (b) All cyclostomes do not possess jaws and paired fins
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.
