Multiple choice

Oxygen is found in many places on Earth, because of this it is from

  1. Biotic factors

  2. Biotic and Abiotic factors

  3. abiotic factors
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen is found in many places on Earth because it comes from both biotic factors (living organisms like plants producing oxygen through photosynthesis) and abiotic factors (non-living sources like atmospheric processes and chemical reactions in rocks/minerals). If it came only from biotic factors, oxygen would only exist where life exists. If only from abiotic, oxygen wouldn't be tied to biological processes.

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