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Q.

Lancelet (a chordate) shows similarity with rotifers (non-chordates) by the presence of 

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a

protonephridia as excretory structures

b

hermaphroditism

c

gills connected to pharynx

d

dorsal tubular heart

answer is C.

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Detailed Solution

Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids and the cephalochordate (lancelet) – Amphioxus.

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Lancelet (a chordate) shows similarity with rotifers (non-chordates) by the presence of