Q.

Tube within a tube body plan is shown by

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a

Platyhelminthes

b

Aschelminthes 

c

Porifers

d

Coelenterates

answer is C.

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Detailed Solution

Aschelminths show a tube within a tube body plan. They possess a false body cavity while the digestive canal has two openings i.e., it starts with a mouth and ends with an anus. 

Platyhelminths are flatworms 

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