Pl select all that apply. hemoglobin picks up oxygen has an attraction for carbon monoxide has an iron ion is found in erythrocytes

The correct options are -

picks up oxygen

has an attraction for carbon monoxide

has an iron ion

is found in erythrocytes

Explanation:

Hemoglobin is the iron ion-containing metalloprotein that transports oxygen, present in the red blood cells (erythrocytes) of almost vertebrates. It is was also present in some invertebrates.

Hemoglobin in blood takes oxygen from the lungs or gills and transport to the rest of the body. It was also brought carbon dioxide back to the lungs.

Thus, all options are correct options.

the denominator has a very specific role.