Haemoglobin $(Hb)$ is a

With which part of $Hb$,$O_2$ molecules bind?

The hemoglobin of a human fetus:

The Haldane effect is caused by which of the following?

Under normal physiological conditions in human beings,every $100 \ ml$ of oxygenated blood can deliver how much $O_2$ to the tissues (in $ml$)?

People living at sea level have around $5 \; million$ $RBCs$ per cubic millimetre of their blood,whereas those living at an altitude of $5400 \; m$ have around $8 \; million$. This is because at high altitude: