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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.

Human Anatomy & Physiology (11th Edition)
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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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 1. oxygen levels? Cellular respiration helps maintain oxygen levels, while photosynthesis has no effect. Photosynthesis helps maintain oxygen levels, while cellular respiration has no effect. С. A. В. Cellular respiration removes oxygen from the atmosphere, while photosynthesis adds oxygen to the atmosphere. Photosynthesis removes oxygen from the atmosphere, while cellular respiration adds oxygen to the D. atmosphere.
Transcribed Image Text: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 1. oxygen levels? Cellular respiration helps maintain oxygen levels, while photosynthesis has no effect. Photosynthesis helps maintain oxygen levels, while cellular respiration has no effect. С. A. В. Cellular respiration removes oxygen from the atmosphere, while photosynthesis adds oxygen to the atmosphere. Photosynthesis removes oxygen from the atmosphere, while cellular respiration adds oxygen to the D. atmosphere.
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