Photosynthetic organisms were present when Earth was primarily anoxic. Why was the appearance of cyanobacteria critical for the oxidation of the atmosphere? a) The early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere. b) Cyanobacteria carry out anoxic photosynthesis. c) The early forms of photosynthesis did not produce oxygen as a waste product. d) The early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere.
Photosynthetic organisms were present when Earth was primarily anoxic. Why was the appearance of cyanobacteria critical for the oxidation of the atmosphere? a) The early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere. b) Cyanobacteria carry out anoxic photosynthesis. c) The early forms of photosynthesis did not produce oxygen as a waste product. d) The early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere.
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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Transcribed Image Text:Photosynthetic organisms were present
when Earth was primarily anoxic. Why was
the appearance of cyanobacteria critical for
the oxidation of the atmosphere?
a) The early forms of photosynthesis
were carried out in the water, and there
was no way for the oxygen to move into
the atmosphere.
b) Cyanobacteria carry out anoxic
photosynthesis.
c) The early forms of photosynthesis did
not produce oxygen as a waste product.
d) The early forms of photosynthesis did
produce oxygen, but it was not enough
to make a difference in the atmosphere.
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