A caudal fin is a _____.

wing
tail
vertebrae
gill
lung

tail

Invertebrate

A)having a repeating pattern which stretches outward from the center
B)an animal having no backbone
C)the rear; toward the rear
D)sameness, balance, or harmony as a result of a repeated pattern
E)an animal having a backbone

B) an animal having no backbone

A caudal fin is a tail.

To arrive at this answer, we can break down the question and consider the options. Given the choices "wing," "tail," "vertebrae," "gill," and "lung," we need to determine which one best fits the definition of a caudal fin.

First, we can eliminate options that are clearly unrelated. "Wing" doesn't refer to a tail structure, so we can eliminate that choice. Similarly, "vertebrae," "gill," and "lung" are not specific to tail anatomy.

This leaves us with the option "tail." A tail is a structure that extends from the rear of an animal's body and is commonly used for balance, locomotion, and other functions. A caudal fin, specifically, refers to the tail fin found in aquatic animals, such as fish and whales. Therefore, "tail" is the correct answer in this case.