Definitions / Explanation:
$(i)$ Exonephric
$(ii)$ Enteronephric

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(N/A) $(i)$ In earthworm,integumentary nephridia discharge excretory wastes directly to the exterior of the body surface,which is termed as Exonephric.
$(ii)$ In earthworm,septal and pharyngeal nephridia discharge excretory wastes into the alimentary canal,which is termed as Enteronephric.

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