Question

select all that apply
what are the key (defining) features of jawed fishes?
a vertebral column
paired appendages
a tail
an endoskeleton
internal gills
nutritional deficiencies
single - loop circulation
internal organs

Explanation:

• A vertebral column: Jawed fishes are vertebrates, so they have a vertebral column.
• Paired appendages: This is a key feature of jawed fishes (like fins).
• An endoskeleton: They have an internal skeleton.
• Internal gills: Used for respiration.
• Single - loop circulation: A characteristic of their circulatory system.
• Internal organs: As complex organisms, they have internal organs.
• A tail is not a defining feature unique to jawed fishes (many other organisms have tails). Nutritional deficiencies are not a defining feature but rather a possible health issue.

Answer:

A. A vertebral column, B. Paired appendages, D. An endoskeleton, E. Internal gills, G. Single - loop circulation, H. Internal organs