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1. Hemichordata was considered as a sub-phylum under phylum Chordata earlier. 2. Now it is placed as a separate phylum under non-chordata. 3. This phylum consists of a small group of worm-like marine animals. Regarding 1,2 and 3 :

( a ) All are correct
( b ) 3 is incorrect; 1 and 2 are correct
( c ) 2 is incorrect but 1 and 3 are correct
( d ) 1 is incorrect but 2 and 3 are correct

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