What Must Be True of Any Organ Described as Vestigial

question 36

Multiple Choice

What must be true of any organ described as vestigial?

• A) It must be analogous to some feature in an ancestor.
• B) It must be homologous to some feature in an ancestor.
• C) It must be both homologous and analogous to some feature in an ancestor.
• D) It need be neither homologous nor analogous to some feature in an ancestor.

---

Definitions:

Pericardial Sac

A double-layered membrane enclosing the heart, providing lubrication and protection against friction.

Pelvic Cavity

A body cavity that is bounded by the bones of the pelvis, containing reproductive organs, the urinary bladder, and the rectum.

Body Cavities

Defined spaces within the body that house organs and other structures, such as the thoracic, abdominal, and pelvic cavities.

Mesentery

A double layer of peritoneum that attaches the intestines to the wall of the abdomen, providing support and containing blood vessels, nerves, and lymphatics.