Multiple choice

Why does all the oxygen in the atmosphere not get used up though a large number of organisms are consuming it?

  1. Oxygen is produced using oxygen cylinders.

  2. Oxygen is replenished in the air by the plants during photosynthesis.

  3. Oxygen is released in the atmosphere from the oceans by aquatic animals.

  4. Oxygen is released in the atmosphere by respiration of animals.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen is replenished in the air by the plants during photosynthesis.

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