Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question

Transcribed Image Text:**Which phylum is characterized by a "tube within a tube" structure?**
- Echinodermata
- Mollusca
- Arthropoda
- Annelida
This question poses a multiple-choice query about the characteristics of different phyla. The "tube within a tube" structure typically refers to a body plan in which there is a digestive tract (inner tube) that runs through the length of the organism's body (outer tube). This is a common trait in more complex and evolved organisms and is considered a significant advancement in the animal kingdom.
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