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Most species of tubifex worms live at the bottom of ponds, lakes and rivers where the partial pressure of oxygen is low. Pollution of water by sewage can cause the partial pressure of oxygen to fall below 0.2 kPa.Figure 3 shows the oxyhaemoglobin dissociation curve for a species of tubifex worm found in a river polluted with sewage.The species of tubifex worm in Figure 3 has 50% saturation of their haemoglobin with oxygen at 0.08 kPa.Explain how this enables this species to survive in water polluted with sewage.
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