Main Idea Details
Echinoderms and Invertebrate Chordates 281
Echinoderms Are
Deuterostomes
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Body Structure
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Analyze the importance of deuterostome development.
Sequence the steps that occur in the water-vascular system to
enable an echinoderm to move. Complete the flowchart by writing
the letters of the scrambled steps in the proper boxes.
The echinoderm moves.
A. Water is forced into the tube foot.
B. Water moves through the stone
canal to the ring canal.
C. Water is drawn into the
madreporite.
D. The muscles of the ampulla
contract.
E. With hydraulic suction, the tube
foot attaches to a surface.
F. Water moves to the radial canals.
Identify the echinoderm that moves in the described way.
Echinoderm Movement
burrows into rocky areas using movable spines
makes snakelike movements using tube feet and
arms
uses cirri to grasp soft sediments on the seafloor
crawls using tube feet and body wall muscles
Section 27.1 Echinoderm Characteristics (continued)
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