Which of the following is/are the excretory structures of an earthworm?
a)Septal nephridia, integumentary nephridia, pharyngeal nephridia.
b)Kidneys, flame cells, body surface.
c)Protonephridia, Malpighian tubules, body surface.
d)Flame cells, body surface, Malpighian tubules.
1
(a) only
2
(a) and (b) only
3
(c) only
4
(a) and (d) only