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  1. Oxygen in our blood is transported by a protein named

    2. A.

     Keratin
    B.

     Myoglobi
    C.

     Collagen
    D.

     Haemoglobin

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    Answer : Option D

    Explanation :

    Hemoglobin, or Hb, is a protein molecule found in red blood cells (erythrocytes) made of four subunits: two alpha subunits and two beta subunits.

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