How did Earth come to have an oxygen atmosphere?
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A. Oxygen was the primary gas origina...
How did Earth come to have an oxygen atmosphere?
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A. Oxygen was the primary gas originally in Earth's atmosphere.
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B. Volcanoes released oxygen into the atmosphere.
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C. Early organisms created oxygen from other gases in the
atmosphere.
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D. Precambrian rocks released oxygen into the atmosphere.
Answers: 3
Biology, 22.06.2019 01:20
Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.
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Biology, 22.06.2019 06:50
Which organelle breaks down sugar molecules that supply energy to the cell ?
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Biology, 22.06.2019 10:50
What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis
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