Multiple choice Identify the phylum whose characteristic feature is the presence of notochord? Mollusca Vertebrata Annelida Platyhelminthes Reveal answer Fill a bubble to check yourself B Correct answer Explanation Vertebrata (a subphylum of Chordata) is characterized by the presence of notochord during embryonic development. Mollusca, Annelida, and Platyhelminthes do not have notochord.