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the basis of your understanding of the following passage and related studied concepts:
Regardless of the gas exchange system present, the amount of oxygen that can be carried in solution in the blood is small. The efficiency of gas exchange in animals is enhanced by the presence of respiratory pigments. All respiratory pigments consist of proteins complexed with iron or copper. They combine reversibly with oxygen and greatly increase the capacity of blood to transport oxygen and deliver it to the tissues.
For example, the amount of oxygen dissolved in the plasma in mammals is only about 2  cm^3O_2 per liter. However the amount carried bound to haemoglobin is 100 times this. Haemoglobin is the most widely distributed respiratory pigment and is characteristic of all vertebrates and many invertebrate taxa.
Why does the small and single-celled animals such as Amoeba, not require any respiratory pigment?

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