(B) Haemoglobin has a significantly higher affinity for $CO_2$ compared to $O_2$. In fact,the affinity of haemoglobin for $CO_2$ is approximately $20$

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(B) Haemoglobin has a significantly higher affinity for $CO_2$ compared to $O_2$. In fact,the affinity of haemoglobin for $CO_2$ is approximately $20$ to $25$ times greater than its affinity for $O_2$. This property is crucial for the transport of $CO_2$ from tissues to the lungs.