Freshwater flatworms and earthworms are similar in that their excretory systems reabsorb electrolytes and eliminate concentrated urine.

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Freshwater flatworms use flame cells for excretion, which primarily remove excess water and small solutes, not producing concentrated urine. Earthworms have nephridia that filter fluid from the coelom, reabsorb useful substances, and excrete waste as dilute urine, not concentrated urine.

Freshwater Flatworms and Earthworms Are Similar in That Their Excretory