Identify the statement which is most appropriate (a)All reptiles have a three - chambered heart (b)All pisces have gills covered by an operculum (c)All mammals are viviparous (d)All cyclostomes do not possess jaws and paired fins.
Option D All mammals are not Viviparous. Four species of Echidna and the Platypus are oviparous. 2. All cyclostomes are jawless and lack paired fins. 3. Crocodile is a reptile but has a four chambered heart unlike all other reptiles. 4. Only the member of osteichthyes have gills covered by operculum while members of chondrichthyes lack operculum. So, the correct option is 'All cyclostomes do not possess; jaws and paired fins'.
