Identify the group of structural organs that have similar functions:
Typhlosole in earthworms, intestinal villi in rats, and contractile vacuole in Amoeba
Nephridia in earthworms, Malpighian tubules in cockroaches, and urinary tubules in rat
Antennae of cockroach, tympanum of frog, and clitellum of earthworm
Incisors of rats, gizzard (proventriculus) of cockroaches, and tube feet of starfish
Nephridia in earthworms, Malpighian tubules in cockroaches, and urinary tubules in rats are all organs responsible for excretion and waste removal in their respective organisms. They help eliminate metabolic waste and maintain the overall balance of fluids and chemicals in the body. While the specific structures may differ, their function of excretion is similar.
Hence, the correct answer is option 2.