Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Chapter 27, Problem 3TYU

Which of the following was probably the least important factor in bringing about the Cambrian explosion?

  1. A.    the emergence of predator-prey relationships among animals
  2. B.     the accumulation of sufficient atmospheric oxygen to support the more active metabolism of mobile animals
  3. C.     C . the movement of animals onto land
  4. D.    the origin of Hox genes and other genetic changes affecting the regulation of developmental genes
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