Biology

The correct answer is: B. Bony skeleton.

1. Analyze the traits in the phylogenetic tree:

Vertebrae: The trait “Vertebrate skeleton” is at a common branch for both sharks and ray - finned fish. This means both sharks (which have a cartilaginous vertebral skeleton) and ray - finned fish have a vertebrate skeleton. So, vertebrae do not separate them.

Bony skeleton: Sharks are cartilaginous fish and do not have a bony skeleton. Ray - finned fish have the derived trait of a bony skeleton. This trait is located on th...