Why don't protists (eg. sponges) need circulatory systems? Question 12 options: None of their cells are in contact with their externl environment so that waste can not diffuse out of their bodies. All of their cells are in contact with their external environment so that nutrients and oygen can diffuse into cells. This is a misleading question because all animals have circulatory systems. They are such simple animals that they don't need oxygen.

Protists are a diverse group of eukaryotic organisms that are found in nearly every habitat on…

Answered: Why don't protists (eg. sponges) need…

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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Why don't protists (eg. sponges) need circulatory systems?

Question 12 options:

	None of their cells are in contact with their externl environment so that waste can not diffuse out of their bodies.
	All of their cells are in contact with their external environment so that nutrients and oygen can diffuse into cells.
	This is a misleading question because all animals have circulatory systems.
	They are such simple animals that they don't need oxygen.

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