Question

breathing in oxygen is essential for most living organisms, including humans. we obtain oxygen from the air we breathe, and its necessary for our cells to produce energy and keep us alive.
which gas do we need to breathe in for survival?

• hydrogen
• oxygen
• argon

Explanation:

The provided text states that breathing in oxygen is essential for humans and most living organisms, as it is needed for cells to produce energy and sustain life. The other options (Hydrogen, Argon) are not identified as necessary for survival via breathing.

Answer:

Oxygen