Which group possess excretory structures known as protonephridia?
A)flatworms
B)earthworms
C)insects
D)vertebrates
E)cnidarians

Question

Quizplus · Accepted Answer

Flatworms possess excretory structures known as protonephridia, which are specialized cells called flame cells that filter fluid and remove waste from the body. Earthworms have nephridia, insects have Malpighian tubules, vertebrates have kidneys, and cnidarians have simple diffusion as their excretory structures.

Which Group Possess Excretory Structures Known as Protonephridia