a.is a respiratory pigment that is colorless when deoxygenated
b.combines irreversibly with oxygen for transport within the body of various organisms.
c.has an iron-porphyrin group that is responsible for oxygen transport
d.is a respiratory pigment found in the blood of some invertebrate and vertebrate species
e.is bright red in color when combined with oxygen
is a respiratory pigment that is colorless when deoxygenated
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