Examlex
The average performance of a large sample of children of a given age is called
Hemoglobin
A protein in red blood cells that carries oxygen from the lungs to the rest of the body and returns carbon dioxide to be exhaled.
Oxygen
A chemical element (O) that is a highly reactive nonmetal, essential for most forms of life on Earth, and a key component of the atmosphere.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, absorbed by plants in photosynthesis.
Carbonic Acid
A weak acid formed in solution when carbon dioxide reacts with water (H2CO3).
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