Formerly, hemichordates were inappropriately included in Chordata based on the presence of
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a
Ventral heart
b
Enterocoelom
c
Stomochord
d
Post-anal tail
answer is C.
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Detailed Solution
Formerly, Hemichordata was classified as a sub-phylum under Chordata because stomochord was inappropriately considered homologous to notochord. Now, it is treated as a separate non-chordate phylum.