ScienceQuestion 70 of 120
Which gas do humans need to breathe in to survive?
a.Carbon dioxide
b.Oxygen
c.Nitrogen
d.Hydrogen
Explanation
Humans inhale oxygen, which cells use to release energy from food through respiration. We exhale carbon dioxide as a waste product. Although nitrogen is the most abundant gas in air, the body does not use it for respiration.
Practice all 120 questions free — no signup required.
Related questions on this topic
- Which part of a plant cell captures light energy for photosynthesis?
- What is the chemical formula for water?
- In a food chain, organisms that make their own food using sunlight are called—
- A scientist records that a substance boils at 100°C at sea level. Boiling point is an example of a—
- Which of the following best describes the function of the heart?
- What force pulls objects toward the center of the Earth?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against GED (General Educational Development) · How we review