Question

When examining the excretory system of insects and identifying the specialized structure primarily responsible for removing nitrogenous metabolic wastes from the haemolymph, while also helping in the regulation of water and ionic balance within the insect body, which of the following structures should be correctly identified as the principal excretory organ?

A Nephridia
B Flame cells
C Green glands
D Malpighian tubules
E Contractile vacuoles
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