Which of the following structures does not serve to increase surface area for nutrient absorption?
A) A human's intestinal villi
B) An earthworm's infolding of the intestinal wall
C) A shark's spiral valve
D) A bird's gizzard
E) A human intestinal microvilli

Question

Quizplus · Accepted Answer

A bird's gizzard is an organ that grinds up food mechanically, but does not increase surface area for nutrient absorption.

Which of the Following Structures Does Not Serve to Increase