Answer:
oxygen
Explanation:
oxygenated state it is called Oxyhemoglobin and is bright red in the reduced state of hemoglobin.
Hemoglobin is pigment in body containing iron, which helps in transport of oxygen. When hemoglobin degrade in body, it forms bilirubin and and biliverdin.
Bilirubin and biliverdin are the bile pigments formed by breakdown of hemoglobin.
The heme ring in hemoglobin is broken down by enzyme heme oxygenase, forming biliverdine, which is then reduced by enzyme reductase to form bilirubin.
Thus, bilirubin and biliverdin are formed by decay of hemoglobin over time.
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