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[A] : The Ascidian tadpole larva possess...

[A] : The Ascidian tadpole larva possess all the basic chordate characters.
[R] : Both urochordates and other chordates have originated from a common ancestor .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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