Which group has a skeleton composed of bone and includes tuna and trout as examples?

Which group has a skeleton composed of bone and includes tuna and trout as examples?

• A. Jawless Fishes (Agnatha)
• B. Bony Fish (Osteichthyes)
• C. Cartilaginous Fish
• D. Open Jawed Mouth for Feeding

Answer: (B)

Tuna and trout are examples of bone-based skeletons, not cartilage. This places them in the group of bony fish, Osteichthyes, whose internal framework is ossified bone tissue. Members of this group typically have a calcified skeleton, a protective bony operculum over the gills, and often a swim bladder for buoyancy. In contrast, jawless fishes have no jaws and a largely cartilaginous or non-bony framework, while cartilaginous fishes like sharks and rays have skeletons made of cartilage rather than bone. The option describing an open jawed mouth for feeding isn’t a formal vertebrate group and doesn’t describe a skeleton type. So, the best answer is the bony fish.

Tuna and trout are examples of bone-based skeletons, not cartilage. This places them in the group of bony fish, Osteichthyes, whose internal framework is ossified bone tissue. Members of this group typically have a calcified skeleton, a protective bony operculum over the gills, and often a swim bladder for buoyancy. In contrast, jawless fishes have no jaws and a largely cartilaginous or non-bony framework, while cartilaginous fishes like sharks and rays have skeletons made of cartilage rather than bone. The option describing an open jawed mouth for feeding isn’t a formal vertebrate group and doesn’t describe a skeleton type. So, the best answer is the bony fish.