1. Earth's atmosphere is about 21 percent oxygen. This percentage has remained about the same throughout human history and even earlier. How have cellular respiration and photosynthesis helped maintain relatively constant oxygen levels? Cellular respiration helps maintain oxygen levels, while photosynthesis has no effect. B. Photosynthesis helps maintain oxygen levels, while cellular respiration has no effect. C. A. Cellular respiration removes oxygen from the atmosphere, while photosynthesis adds oxygen to the atmosphere. D. Photosynthesis removes oxygen from the atmosphere, while cellular respiration adds oxygen to the atmosphere.
1. Earth's atmosphere is about 21 percent oxygen. This percentage has remained about the same throughout human history and even earlier. How have cellular respiration and photosynthesis helped maintain relatively constant oxygen levels? Cellular respiration helps maintain oxygen levels, while photosynthesis has no effect. B. Photosynthesis helps maintain oxygen levels, while cellular respiration has no effect. C. A. Cellular respiration removes oxygen from the atmosphere, while photosynthesis adds oxygen to the atmosphere. D. Photosynthesis removes oxygen from the atmosphere, while cellular respiration adds oxygen to the atmosphere.
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter8: Photosynthesis
Section: Chapter Questions
Problem 3VCQ: Figure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide,...
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