Choanoflagellates have collagen and the same genes coding for cell communication and adhesion that present in multicellular animals with bodies. Which best explains what this reveals regarding the evolution of multicellular bodies in animals? A) All of the genetic machinery and all of the body building materials (or similar precursors) evolved only after the appearance of multicellular bodies. B) The genetic machinery and some of the same body building materials (or similar precursors) are present in single-celled organisms, thus natural selection could use these for the evolution of multicellular bodies. C) That multicellular bodies evolved only once in evolutionary history, and it was within animals because collagen was present, along with the genetic machinery necessary for cell adhesion and communication. D) None of the above.

Animals, plants, green algae, fungi, and slime moulds are all multicellular organisms, but they each…

Answered: Choanoflagellates have collagen and the…

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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Choanoflagellates have collagen and the same genes coding for cell communication and adhesion that present in multicellular animals with bodies. Which best explains what this reveals regarding the evolution of multicellular bodies in animals?

		A) All of the genetic machinery and all of the body building materials (or similar precursors) evolved only after the appearance of multicellular bodies.
		B) The genetic machinery and some of the same body building materials (or similar precursors) are present in single-celled organisms, thus natural selection could use these for the evolution of multicellular bodies.
		C) That multicellular bodies evolved only once in evolutionary history, and it was within animals because collagen was present, along with the genetic machinery necessary for cell adhesion and communication.
		D) None of the above.

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