Select the incorrect statements with respect to Cyclostomes. 
A. They lack scales and paired fins. 
B. They have circular mouth with jaws. 
C. They bear 6-15 pairs of gills. 
D. They migrate to deep sea for spawning. 
Choose the most appropriate answer from the options given below.

B and D are incorrect. A and C are correct. Cyclostomes include lampreys and hagfish.
A. Cyclostomes lack true scales and paired fi ns. They possess only median fins (dorsal fin, ventral fin and caudal fin)
B. Cyclostomes lack jaws. They possess a circular, sucker-like mouth that lacks true jaws. This mouth structure is adapted for attachment to the bodies of other fi sh, which they use as a host for feeding.
C. Cyclostomes possess between 6 to 15 pairs of gills-slits.
D. Cyclostomes, particularly lampreys, do not migrate to the deep sea for spawning. Instead, lampreys migrate
from sea to freshwater environments to spawn in shallow, gravelly areas of rivers or streams.