Which of the following statements most accurately describes the Cyclostomata group?
1
They are characterised by having an elongated eel-like body, circular mouth, slimy skin and are scaleless.
2
They are ectothermic animals having mucus glands in the skin, and a three chambered heart.
3
They are warm-blooded, oviparous, bipedal, feathered, winged and toothless vertebrates.
4
Their skin is covered with scales/plates and their hearts have only two chambers.