Answer:
There is evidence in fossils, the scientists can scan the fossil to see the date.
Explanation:
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Nitrogen fixers are bacteria
Answer:
the part of the passage that describes communicating the findings is:
he presented his experiment and results to his coworkers, and they discussed his conclusions.
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Explanation:
this is when he tells other people about his findings
The simplified drawing shows how changes in polar vortex winds high in the stratosphere can influence the North Atlantic to cause changes in the global "conveyor belt" of ocean circulation.