Answer:
Photosynthetic organisms was the reason of these atmospheric changes.
Explanation:
The plant which is discovered by the scientists that is apparently devoid of life but has ice caps located at the poles which reveals that planet's atmospheric O₂ levels sharply increased about 1,000,000 years ago was due to evolution of photosynthetic organisms like cyanobacteria etc which went extinct and then O₂ levels dropped quickly 50,000 years ago. So photosynthetic organisms was the reason of these atmospheric changes.
As the land surface heats up in summer, it generates a thermal low pressure. Air from the relatively high-pressure region over the ocean blows into this thermal low. This is called the <u>monsoon.</u>
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<h3><u>A Monsoon: What Is It?</u></h3>
A monsoon is a change in wind patterns that frequently results in either a very wet or a very dry season. Although monsoons are typically associated with sections of Asia, they can occur in many tropical and subtropical climates, including numerous locations in the United States.
<u>What triggers a monsoon?</u>
A seasonal change in the winds is what triggers a monsoon. The seasonal differences in land and water temperatures cause the winds to fluctuate. For instance, the ground warms up more quickly than bodies of water at the start of summer. The direction of the monsoon winds is always from chilly to warm. In the summer, conditions arise that cause the wind to blow in the opposite direction.
Learn more about monsoons with the help of the given link:
brainly.com/question/28062860
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The Great Lakes — Superior, Huron<span>, </span>Michigan<span>, </span>Ontario<span> and Erie — make up the largest body of fresh water on Earth, accounting for one-fifth of the freshwater surface on the planet at 6 quadrillion gallons</span>
The answer is b an astronomical unit
