Class 9
Chapter 7 Class 9 - Diversity In Living Organisms
  • They are exclusively marine animals.
  • They are triploblastic and have a coelomic cavity.
  • These are spiny skinned organisms.
  • They exhibit organ system level of organization. Most members have a circulatory system as well as a digestive system.
  • They also have a peculiar water-driven tube system that they use for moving around.
  • They have hard calcium carbonate structures that they use as a skeleton. 

For Example: sea stars, sea urchins.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo