What is the main difference between Chondrichthyes and Osteichthyes?

A. cartilaginous skeleton और bony skeleton / Cartilaginous skeleton and bony skeleton

Step 1: Identify fish classification. Step 2: Chondrichthyes have cartilaginous skeleton while Osteichthyes have bony skeleton. Step 3: Remember chondro equals cartilage and osteo equals bone.

Step 1: fish classification पहचानें। Step 2: Chondrichthyes में cartilage skeleton और Osteichthyes में bony skeleton होता है। Step 3: Chondro equals cartilage और osteo equals bone याद रखें।