Question

4.
is an iron-containing protein that binds
chemically to oxygen molecules

Answer 1

Answer:

Hemoglobin, also spelled haemoglobin, iron-containing protein in the blood of many animals—in the red blood cells (erythrocytes) of vertebrates—that transports oxygen to the tissues. Hemoglobin forms an unstable reversible bond with oxygen.

Answer 2

Explanation:

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