Can You Pass This 5th Grade Science Quiz?

Emily Izsak|General Knowledge|26 Jun 2024

What Do We Breathe Out?

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Retry Correct Incorrect We breathe out both carbon dioxide (CO2) and water (H2O). We also breathe out heat energy because of a process known as cellular respiration. We breathe in oxygen (O2) and some nitrogen from the environment.
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Photo by Al Bello/Getty Images
Photo by Al Bello/Getty Images

What Do We Breathe Out?

  • O2
  • CO2 and H2O
  • Just CO2
  • Just H2O
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