Bulbous

A)an organ for breathing underwater, consisting of membranes through which oxygen can pass
B)made of cartilage, which is a strong, elastic connective tissue
C)rounded, like something swollen
D)a deep sea fish with a skeleton of cartilage
E)a fin that is a fish's tail

C)rounded, like something swollen

Cartilaginous

A)an organ for breathing underwater, consisting of membranes through which oxygen can pass
B)made of cartilage, which is a strong, elastic connective tissue
C)rounded, like something swollen
D)a fin that is a fish's tail
E)a deep sea fish with a skeleton of cartilage

B)made of cartilage, which is a strong, elastic connective tissue.

The correct answer is C) rounded, like something swollen.

To arrive at this answer, let's break down the question:

The word "bulbous" is given, and we are asked to choose the best definition among the options provided.

When we analyze the options provided:
A) An organ for breathing underwater, consisting of membranes through which oxygen can pass: This choice does not match the definition of "bulbous" which is related to shape or appearance, not a specific organ.
B) Made of cartilage, which is a strong, elastic connective tissue: This choice describes something made of cartilage, but it does not relate to the meaning of "bulbous".
C) Rounded, like something swollen: This choice matches the definition of "bulbous" as it describes a rounded shape that appears swollen.
D) A deep sea fish with a skeleton of cartilage: This choice describes a type of fish with a specific skeleton composition, which is not related to the general meaning of "bulbous".
E) A fin that is a fish's tail: This choice does not represent the correct definition of "bulbous" as it describes a fish's fin, not a shape or appearance.

Hence, the correct answer is C) rounded, like something swollen.