Why poriferans and cnidarians do not have excretory systems, Biology

Poriferans and cnidarians do not have excretory systems. Do platyhelminthes have an excretory system?

Platyhelminthes have a primitive excretory system made of flame cells (also known solenocytes), excretory pores and excretory ducts.

Image Diversity: platyhelminth excretory system

 

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