the correct characteristics of Cyclostomes are: 1. They have a sucking and circular mouth without jaws. 2. Their body is devoid of scales and paired fins. 3. Circulation is of the closed type. 4. They are marine but migrate to fresh water for spawning. 5. Cranium and vertebral column are cartilaginous. Any statement suggesting they have jaws, scales, paired fins, open circulation, or spawn in the ocean would be incorrect.