How has oxygen increased and carbon dioxide decreased 4.9.1.3-4 Flashcards by Destiny Allison | Brainscape

Q

How have levels of oxygen increased?

A

Algae and plants produced the oxygen in our atmosphere by photosynthesis
over billions of years plants have evolved and the percentage of oxygen has increased allowing animals to evolve

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Q

How have levels of carbon dioxide decreased?

A

algae and plants decreased the percentage by photosynthesis
also decreased by dissolving in oceans

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