Q.

Assertion (A): Hemichordata is now placed as separate phylum under non-chordata.
Reason (R): The stomochord of these animals was once believed to be the notochord.

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a

 A is correct but R is incorrect.

b

 Both A and R are correct but R is not the correct explanation of A.

c

A is incorrect but R is correct.

d

Both A and R are correct and R is the correct explanation of A.

answer is B.

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Detailed Solution

Stomochord is  an outgrowth from roof of buccal cavity not comparable to notochord ,hence separated from the phylum Chordata.

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