Shown below are cross sectional diagrams of three animals P, Q and R. Which of the following is correct regarding organisms P, Q and R?
A
Organism P is always diploblastic whereas organisms Q and R are triploblastic.
B
Organism Q could be a flatworm or a roundworm.
C
Body cavity of organism Q arises from embryonic mesoderm.
D
Organism R could be an annelid or an echinoderm.
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The correct Answer is:
D
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