Answer:
Paired fins.
Step-by-step explanation:
Jawless fish belongs to the superclass agantha and consists of cyclostomes and ostracoderms. The first true vertebrates evolve on the earth is jawless fishes.
The jawless fish do not consist of stomach, jaws and paired fins. Lateral line systems, notochord and gills are present in jawless fish. Two chambered heart is present in jawless fish.
Thus, the correct answer is option (1).