Biology: The Unity and Diversity of Life
Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Chapter 19, Problem 8SQ

The evolution of _______ resulted in the eventual formation of the ozone layer.

  1. a. DNA based genomes
  2. b. aerobic respiration
  3. c. sexual reproduction
  4. d. oxygen-producing photosynthesis
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The evolution of photosynthesis resulted in a. an increase in the amount of O2 in the atmosphere. b. the initial appearance of heterotrophs. c. global warming. d. an increase in the amount of CO2 in the atmosphere
The oxygen revolution changed Earth’s environmentdramatically. Which of the following took advantage of thepresence of free oxygen in the oceans and atmosphere?(A) the evolution of cellular respiration, which used oxygen tohelp harvest energy from organic molecules(B) the persistence of some animal groups in anaerobichabitats(C) the evolution of photosynthetic pigments that protectedearly algae from the corrosive effects of oxygen(D) the evolution of chloroplasts after early protists incorporated photosynthetic cyanobacteria
why was the first mini threshold of life's evolution, photosynthesis, so important? a. it helped plants move onto land b. it transformed our atmosphere from oxygen-rich to carbon dioxide-rich c. it allowed life to spread beyond oceanic vents d. it forced organism to become multicellular to process more complex energy
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