PRINCIPLES OF BIOLOGY TEXT & CODE
PRINCIPLES OF BIOLOGY TEXT & CODE
16th Edition
ISBN: 9781269502528
Author: Pearson
Publisher: PEARSON
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Chapter 25, Problem 2TYU

The oxygen revolution changed Earth's environment dramatically. Which of the following took advantage of the presence of free oxygen in the oceans and atmosphere?

  • (A) the evolution of cellular respiration, which used oxygen to help harvest energy from organic molecules
  • (B) the persistence of some animal groups in anaerobic habitats
  • (C) the evolution of photosynthetic pigments that protected early algae from the corrosive effects of oxygen
  • (D) the evolution of chloroplasts after early protists incorpo-rated photosynthetic cyanobacteria
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How the evolution of oxygen was involved in the initial evolution of terrestrial life?
Chronologically arrange the evolutionary events with 1 being the earliest and 6 the most recent.  ____ 1 a. Onset of oxygen-releasing pathway of photosynthesis ____ 2 b.Liquid water appears ____ 3 c.Origin of protocells ____ 4 d. Emmergence of the first eukaryotes ____ 5 e. Origin of chloroplasts ____ 6 f. The big bang
Scientist have determined that the early Earth had no free oxygen anywhere. Briefly explain what evidence in the rock layers that scientists found to prove when the early conditions on earth had free oxygen in the atmosphere.

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PRINCIPLES OF BIOLOGY TEXT & CODE

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Endosymbiotic Theory; Author: Amoeba Sisters;https://www.youtube.com/watch?v=FGnS-Xk0ZqU;License: Standard Youtube License