Which Feature Does Not Characterize a Protonephridium

question 176

Multiple Choice

Which feature does not characterize a protonephridium?

• A) It consists of a flame cell and a tubule.
• B) Cells of its tubule modify the composition of the filtrate.
• C) It produces urine that is less concentrated than extracellular fluid.
• D) The filtrate it produces flows toward the excretory pore.
• E) It relies on blood pressure to drive filtration.

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