Multiple choice general knowledge

which nonmetal is needed to sustain life on earth

  1. K4H2O2

  2. P2O

  3. O2

  4. H2O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen (O2) is essential for sustaining life on Earth as it is required for cellular respiration in most organisms. While water (H2O) is also vital, the question specifically asks for a nonmetal, and O2 is the elemental form of oxygen that supports aerobic life. K4H2O2 and P2O are not standard chemical formulas for life-sustaining substances.

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