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5 questions
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  • Q1
    Which of the following is a common source of oxygen in the environment?
    Cars
    Vacuum cleaners
    Computers
    Plants
    30s
  • Q2
    What process do plants use to convert sunlight into oxygen?
    Transpiration
    Fermentation
    Photosynthesis
    Respiration
    30s
  • Q3
    Which of the following statements is true about oxygen in Earth’s atmosphere?
    Oxygen makes up about 21% of Earth's atmosphere.
    Oxygen is found only in water.
    Oxygen is the most abundant gas in the atmosphere.
    Oxygen is a gas we cannot see.
    30s
  • Q4
    In which part of the human body is oxygen transported by the blood?
    Brain
    Stomach
    Kidneys
    Lungs
    30s
  • Q5
    What gas do humans and animals breathe in to survive?
    Hydrogen
    Oxygen
    Carbon dioxide
    Nitrogen
    30s

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