The way in which the presence of molecular oxygen in the atmosphere affects early life. Concept introduction: Photosynthesis is a vital process in primary producers such as cyanobacteria and plants. Plants use the light energy and carbon dioxide from the atmosphere and produce sugars (which are stored in various parts of the plants) and release oxygen.

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Chapter 21.2, Problem 2C

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To explain: The way in which the presence of molecular oxygen in the atmosphere affects early life.

Concept introduction: Photosynthesis is a vital process in primary producers such as cyanobacteria and plants. Plants use the light energy and carbon dioxide from the atmosphere and produce sugars (which are stored in various parts of the plants) and release oxygen.

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