The answer to the question about which word best describes cartilaginous fish is letter A or boneless. The reason why they are called cartilaginous fish is because of the fact that they have cartilage rather than bones. Although they don’t have bones, it does not necessarily mean that they don’t have skeletons. This just means that their skeletons are made of cartilage rather than bones. Some examples of cartilaginous fish are rays, skates and sharks.
In addition to being boneless, cartilaginous fish have gills that open through their slits rather than the bony covering which is present in fish with bones. They can also breathe through their spiracles which are found on top of their heads aside from their gills. Their diet differs greatly – sharks can eat fish, whales and seals while skates and rays can eat crabs, oysters, clams and shrimps.