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lakkis [162]
3 years ago
5

When did cyanobacteria start producing pure oxygen?

Geography
2 answers:
densk [106]3 years ago
0 0

Answer:

b

Explanation:

MissTica3 years ago
0 0

<u>Answer:</u>

<em>Cyanobacteria started producing pure oxtgen </em>

<em>A. After the Hadean eon </em>

<u>Explanation:</u>

<em>Cyanobacteria, otherwise called Cyanophyta,</em> are a phylum of microscopic organisms and plastids that acquire their vitality through photosynthesis. They are the main photosynthetic prokaryotes ready to deliver oxygen.

<em>The name cyanobacteria originates from the shade of the microorganisms. Cyanobacteria started producing pure oxygen after the Hadean eon.</em>

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2 years ago
What about the united states’ geography would influence their foreign policy until this time?
Sunny_sXe [5.5K]

The united states’ geography would influence their foreign policy until this time

<h3>What is foreign policy?</h3>
  • Geography has been more of an ally than an enemy since the beginning of the nation. An island cannot control an entire continent, as the British discovered.
  • America was undoubtedly exposed in those foreign policy. With their imperial aspirations, the French and Spanish posed a threat to North America.
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To learn more about foreign policy with the given link

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Question 5 (1 point)
yKpoI14uk [10]

Answer:

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Explanation:

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2 years ago
Scientists who are concerned about increased carbon dioxide in the atmosphere
Neporo4naja [7]

The scientists that are concerned about increased carbon dioxide in the atmosphere believe global warming is caused by human actions.

Explanation:

The global warming is a fact, but there is a big debate about the main causes of it. On one side are the scientists that believe that the human actions are the main cause of the global warming, on the other side are the scientists that believe it is strictly a natural process, and in the middle are the scientists that believe it is caused by both the human actions and the natural processes.

The scientists that believe that the global warming is caused by the human actions often discount the natural processes and their importance. The human actions increase the effect of the natural processes, but lot of scientists tend to exaggerate the human effect. If the trend of carbon dioxide input into the atmosphere by the human activity at this rate, then in the future it will most probably became a very important factor, while for now is relatively low when compared to the natural processes.

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kkurt [141]

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