Hemoglobin in the blood carries  from the respiratory organs (lungs or gills) to the rest of the body (i.e. the tissues):

(B) Oxygen

Explanation

Hemoglobin in the blood carries oxygen from the respiratory organs (lungs or gills) to the rest of the body (i.e. the tissues). There it releases the oxygen to permit aerobic respiration to provide energy to power the functions of the organism in the process called metabolism.

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