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Artemon [7]
3 years ago
11

Oxygen was initially created in Earth's atmosphere by _____. volcanoes outgassing cyanobacteria photosynthesizing greenhouse eff

ect Ozone breaking down
Biology
2 answers:
VikaD [51]3 years ago
7 0

The answer might be Cyanobacteria photosynthesizing

SCORPION-xisa [38]3 years ago
6 0

The correct answer is B. Cyanobacteria photosynthesizing

Explanation:

Oxygen is a chemical element necessary for most life forms to exist, this includes most animals as they require oxygen for multiple body functions. This element is nowadays one of the most abundant elements in the atmosphere and due to this, life forms are abundant and diverse; however, before photosynthetic organisms oxygen was not part of the Earth's atmosphere. This can be explained as organisms that rely on photosynthesis, use carbon dioxide, water, and sunlight and release oxygen into the atmosphere. Due to this, it is believed oxygen in the atmosphere was the result of cyanobacteria and other primitive organisms that carried out photosynthesis.

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