(i) Ureters in Frog These conduct both urine and spermatozoa to the cloaca. Hence, it is called urinogenital duct in male frog. In female frog, ureters conduct only urine from kidneys to the cloaca.
(ii) Malapighian tubules These are the organs of excretion and osmoregulation in insects.
(iii) Body wall in earthworm It protects the delicate internal organs from injury. It also produces setae.