Social Studies
Social Studies, 30.11.2019 01:31, claudiapineda860

Scientists determined the historic levels of carbon dioxide in the earth’s atmosphere by

1. testing air bubbles in antarctic ice

2. testing soil samples all over the world

3. evaluating tree ring growth

4. mapping the growth of redwood trees

answer
Answers: 3

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Scientists determined the historic levels of carbon dioxide in the earth’s atmosphere by

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