Flatworms can reach a maximum size of around 40cm. Whilst this is big for a worm, there are certainly larger animals on earth. What might it be that restricts the flatworms body size? A.They have an exoskeleton that restricts their growth. B.They do not have a circulatory system. C.They are exothermic animals that have limited energy for growth. D.They are acoelomates and so the growth of their internal organs is restricted by growth of the outer body wall.

Introduction Flatworms or Platyhelminthes are acoelomate, bilaterally symmetrical, soft bodies…

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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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Flatworms can reach a maximum size of around 40cm. Whilst this is big for a worm, there are certainly larger animals on earth. What might it be that restricts the flatworms body size?

	A.	They have an exoskeleton that restricts their growth.
	B.	They do not have a circulatory system.
	C.	They are exothermic animals that have limited energy for growth.
	D.	They are acoelomates and so the growth of their internal organs is restricted by growth of the outer body wall.

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