Choose the correct statement.
(a) All mammals are viviparous.
(b) All cyclostomes do not possess jaws and paired fins.
(c) All reptiles have a threechambered heart.
(d) All pisces have gills covered by an operculum.
(a) All mammals are viviparous.
(b) All cyclostomes do not possess jaws and paired fins.
(c) All reptiles have a threechambered heart.
(d) All pisces have gills covered by an operculum.