Excretion is exonephric by which of the following nephridia? (a) Pharyngeal nephridia (b) Septal...

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Excretion is exonephric by which of the following nephridia?
(a) Pharyngeal nephridia
(b) Septal nephridia
(c) Integumentary nephridia
(d) Integumentary and pharyngeal nephridia
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