Question

why air bladder absent in chondrichythyes​

Answer 1

Answer:

Members of Class chondrichthyes are marine with streamlined body having cartilaginous endoskeleton. Due to the absence of air bladder, they have to swin constantly to avoid sinking. Air bladder is present in Osteicthyes which regulates buoyancy.

Answer 2

Answer:

Hope it helps you mate

Explanation:

Members of Class chondrichthyes are marine with streamlined body having cartilaginous endoskeleton. Due to the absence of air bladder, they have to swin constantly to avoid sinking. Air bladder is present in Osteicthyes which regulates buoyancy.