Question

what has the camel not learned yet​

Answer 1

We are not Camel. Do we don't know...

Answer 2

Answer:

$\fcolorbox{red}{orange}{answer}$

⭐ The Djinn had said to the camel that when he would learn to behave properly and would compensate the loss of three days' work, the hump would be vanished. But even today, the camel has a lump which proves that he has not yet learnt to behave.

Hope I help you!!