Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 32.2, Problem 2R
Summary Introduction
To review:
The ways in which the echinoderms obtain food using their tube feet. The comparison between this feeding mechanism with that of the hemichordates.
Introduction:
The echinoderms and the hemichordates fall under the deuterostome class. The former possesses a radial symmetry, while the latter possesses a bilateral symmetry. The body symmetry of these organisms enables two modes of feeding mechanisms.
The echinoderms possess water canals systems, which extend into tube feet outside their body. The tube feet functions as locomotor organs and at the same time, also serves the gaseous exchange. Along with the water, the food and gases diffuse into the water canal system through the tube feet.
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Define "catch connective tissue". Using specific examples from three of the five major living groups of echinoderms, describe three different ways in which catch connective tissue facilitates food capture.
Why is the madreporite of sea cucumbers internal instead of external like other echinoderms?
Identify the distinguishing characteristics of echinoderms.
Chapter 32 Solutions
Life: The Science of Biology
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- ECHINODERMS a)- Describe in detail how is the Hydrostatic Vascular System (Aquifer) of the Echinoderms. b) Describe flake is gas exchange in Echinoderms. c) -Why are echinoderms specialists in regeneration?arrow_forwardMention three similarities between lancelet and ammocoetes?arrow_forwardBriefly describe the structure of nematodes and explain how it may be used to capture preyarrow_forward
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