Sharks and dogfishes differ from skates and rays because:

Step-by-step solution

Sharks and dogfishes have cylindrical body while skates and rays have both of their pectoral fins fused. It gives a wing-like appearance and are not distinct from body. Related Theory Sharks have a pectoral fin behind the head on either side of its body. These are ofien elongated and are used to keep the shark from sinking to the bottom of the ocean, as well as for steering the fish. The shark's fins are rigid and elongated. They are supported by cartilaginous, non-segmented rods called ceratotrichia. This strength