In both protonephridia and Malpighian tubules
A) urine is expelled directly from excretory tubules to the exterior of the body.
B) urine is modified by tubular reabsorption.
C) fluid is transported into excretory tubules by the action of cilia.
D) K+ is pumped into the lumen.
E) the primary urine is formed by filtration of coelomic fluid.
Correct Answer:
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