Which of the following statements about atmospheric carbon dioxide levels is correct?     For about 800,000 years prior to human influence it varied between 180 and 300 ppm and is now above 410 ppm.     For about 800,000 years prior to human influence it never exceeded 200 ppm.     Its rate of increase in the past century is greater than any seen in the ice core record.     Both 1 & 3

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A: Seasons are caused by the tilted axis of the Earth.

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A: Increases in temperature is one of the serious problem that have to be addressed.

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Q: Oxygen Content of Earth's Atmosphere

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A:

Microbes

Microbes are microscopic living organisms that can only be detected with the help of specialized laboratory equipment called a microscope. These living organisms are so small that they are not visible to the naked eye.