Despite their differences in appearance, all bony fish have common ancestors. their fins develop from similar structures and usually have a prescribed number of bones. because of this, the large rudder-like dorsal fin of a sailfish, the poisonous dorsal fin of a catfish, and the tiny reduced dorsal fin of a puffer fish are said to be structures. a) vestigial b) analagous c) homologous d) evolutionary

The correct answer is C. Homologous

Explanation:

In biology, a homologous structure refers to a structure such as organs that are similar in two different species and that derive from a common ancestor. Also, in homologous structure, the similarity occurs in the traits but not necessarily in the purpose of the structure as each species evolves from a common ancestor and the structures also adapt to different environmental conditions. This type of structure occurs in the bony fish described as they share a common ancestor that made bony fish have similar fins but with different purposes.