Question

chondrichthyes is characterised by?​

Answer 1

Explanation:

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Chondrichthyes is a class that contains the cartilaginous fishes. They are jawed vertebrates with paired fins, paired nares, scales, a heart with it's chambers in series and skeletons made of cartilage rather than bone. They are characterized by placoid scales, which are hard and microscopic in size.

Answer 2

Answer:

Chondrichthyes is a class that contains the cartilaginous fishes. They are jawed vertebrates with paired fins, paired nares, scales, a heart with it's chambers in series and skeletons made of cartilage rather than bone. They are characterized by placoid scales, which are hard and microscopic in size. Mouth is present on the ventral side of the head.