Hemoglobin has tetrahedral structure containing four heme groups that surround a globin group.
Heme is ringlike organic compound also known as a porphyrin to which an iron atom is attached. There are four iron atoms that bind four oxygen atoms and transport them to tissues.
It’s phenotype is brown fur.
The left ventricle must contract with more force in order to send blood to the body's extremities
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Answer:
Earth, Solar System, Milky Way galaxy, Universe.
Explanation:
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