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Breathing air with more than 75% oxygen can cause death within days.
True
ur bodies are accustomed to air containing 21% oxygen.
True
Oxygen is toxic in large doses and can damage cells over time.
True
The first life forms on Earth were anaerobic and could survive without oxygen.
True
Oxygen appeared in the Earth's atmosphere around 2.2 billion years ago during the Great Oxidation Event.
True
Plants produce oxygen through photosynthesis, while animals require oxygen to survive.
True
Animals first appeared about 700 million years ago in the oceans.
True
Atmospheric oxygen levels were high enough around 500 million years ago for animals to move from the ocean to land.
True
Oxygen levels were more abundant 300 million years ago, making up 50% of the air.
True
In oxygen-rich atmospheres, insects can grow larger because they don't need large breathing systems.
True
Breathing air with more than 75% oxygen is completely safe for our lungs and bodies.
False
Our bodies are well-adapted to air containing 75% oxygen or more.
False
Oxygen does not transform into free radicals that can damage our cells over time.
False
The first life forms on Earth were aerobic and relied on oxygen for survival.
False
Oxygen appeared in the Earth's atmosphere around 4 billion years ago.
False
Plants do not produce oxygen through photosynthesis.
False
