Which term refers to the rear end region of the earthworm?

Which term refers to the rear end region of the earthworm?

• A. Clitellum
• B. Waste removal tubes
• C. Segments
• D. Posterior

Answer: (D)

Think in terms of directionality: anterior means the front or head end, while posterior means the back or rear end. For an earthworm, the rear end is described as the posterior, which is the standard anatomical term for the tail region. The clitellum is a thickened, reproductive-band located around the middle of the worm, not at the rear. Waste removal tubes isn’t a fixed anatomical region name for the rear end, and segments are the repeating body units along the length, not a specific end. So the term that best designates the rear end is posterior.

Think in terms of directionality: anterior means the front or head end, while posterior means the back or rear end. For an earthworm, the rear end is described as the posterior, which is the standard anatomical term for the tail region. The clitellum is a thickened, reproductive-band located around the middle of the worm, not at the rear. Waste removal tubes isn’t a fixed anatomical region name for the rear end, and segments are the repeating body units along the length, not a specific end. So the term that best designates the rear end is posterior.