The following are a set of features seen in a group of vertebrates:

A. Body covered with dry and cornified skin, epidermal scales or scutes.
B. Heart is three-chambered but partially four-chambered in some.
C. They are ectothermic and exhibit internal fertilization.
D. Respiration occurs through lungs.
E. Mostly oviparous with eggs covered in calcareous shells.

Which group do these features best describe?