Question

fill in the blank question
an anemic person may appear pale and lack energy due to the reduced iron i - carrying capacity of the blood
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Explanation:

Anemia is often caused by a reduced ability of blood to carry oxygen, which is related to the decreased oxygen - carrying capacity due to lower levels of hemoglobin. Hemoglobin contains iron and is crucial for oxygen transport. So the blank should be filled with 'oxygen'.

Answer:

oxygen