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Air is a mixture of gasses. In order of decreasing abundance they are:

Nitrogen: ~78%

Oxygen: ~ 21%

Argon: ~ 1%

Water vapor ~ 0.4% (variable)

Carbon dioxide: 0.04%

Other gasses are present in trace amounts.

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Name one of the elements that make up carbon dioxide gas?

Carbon and oxygen.....


How is the balance of oxygen and carbon dioxide maintained?

The balance of oxygen and carbon dioxide in the body is maintained through a process called gas exchange. During respiration, oxygen is taken in and carbon dioxide is released. This gas exchange occurs in the lungs where oxygen is absorbed into the bloodstream and carbon dioxide is exhaled out of the body.


How might you use a radioactive isotope to find out whether the oxygen in carbon dioxide comes from sugar or oxygen gas?

You could use a radioactive isotope like carbon-14 to label the sugars during photosynthesis. By tracking the movement of carbon-14 in the carbon dioxide, you can determine if the oxygen in the carbon dioxide comes from sugar or oxygen gas. If the oxygen in the carbon dioxide comes from sugar, the carbon-14 label will also be seen in the oxygen.


Will a burning spilint go out in carbon dioxide gas?

Yes, a burning splint will go out in carbon dioxide gas because carbon dioxide does not support combustion. When the concentration of oxygen is low, the splint will not have enough oxygen to sustain combustion and will be extinguished.


Why algae important in keeping carbon dioxide and oxygen gas concentrations at a balance?

Algae play a critical role in maintaining carbon dioxide and oxygen levels through photosynthesis. During photosynthesis, algae convert carbon dioxide into oxygen, which helps balance the atmospheric oxygen levels. Algae also absorb carbon dioxide from the atmosphere, helping to mitigate excess carbon dioxide and reduce greenhouse gas emissions.

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