Excretory Structures Known as Protonephridia are Present In

Question

Excretory structures known as protonephridia are present in
A)flatworms.
B)earthworms.
C)insects.
D)vertebrates.
E)cnidarians.

Accepted Answer

Protonephridia are present in flatworms, where they function in osmoregulation and waste removal. They consist of specialized flame cells that help to filter out waste from the body fluids.