Read the following Assertion and Reason and choose the correct option. Assertion: Chordata were considered as a subphylum under phylum Hemichordata Reason: Chordates have a rudimentary structure stomochord similar to hemichordates

Step-by-step solution

Hemichordata was earlier considered as a sub-phylum under phylum Chordata. But now it is placed as a separate phylum under non-chordata. Hemichordates have a rudimentary structure in the collar region called stomochord, a structure similar to notochord.