Examlex
Children in the preoperational stage are most concerned with which of the following?
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, absorbed by plants in photosynthesis.
Hemoglobin
A protein found in red blood cells responsible for transporting oxygen from the lungs to the rest of the body and returning carbon dioxide from the body to the lungs.
Oxygen
A chemical element with symbol O and atomic number 8, essential for aerobic respiration in living organisms and supporting combustion.
Heme
An iron-containing component essential for oxygen transport in the blood, found in hemoglobin and myoglobin.
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