Q.

Aschelminthes are advanced over Platyhelminthes by the presence of

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a

nephridia

b

bilateral symmetry

c

body cavity

d

metamerism

answer is C.

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Detailed Solution

Flatworms (Platyhelminthes) are acoelomate while roundworms (Aschelminthes) have a body cavity (pseudocoelom). 

Both Platyhelminthes and Aschelminthes include bilaterally symmetrical animals. 

Metamerism is absent in both Platyhelminthes and Aschelminthes.

Nephridia are absent in Aschelminthes.

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Aschelminthes are advanced over Platyhelminthes by the presence of