What is the common name of the group whose members are characterized by endoskeleton and a unique water vascular system? A. tunicates B. medusas C. echinodermes D. brachiopods Plz Help .-.
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Out of print; available in many libraries. 2001 AP Â® UNITED STATES HISTORY FREE-RESPONSE QUESTIONS Copyright Â© 2001 by College Entrance Examination Board. All rights reserved.Advanced Placement Program and AP are registered trademarks of the College Entrance Examination Board. GO ON TO THE NEXT PAGE.5Document E Source: U.S. News and World Report, December 1957. 2001 AP ï¬ UNITED STATES HISTORY FREE-RESPONSE QUESTIONS Copyright ' 2001 by College Entrance Examination Board.