A Student Observes a Wormlike Organism Crawling About on Dead

question 46

Multiple Choice

A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot) . However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________.

• A) Platyhelminthes; a cuticle of chitin
• B) Nematoda; an alimentary canal
• C) Annelida; a body cavity
• D) Nematoda; a circulatory system
• E) Annelida; muscle in the body wall

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