Question

what is the adaptation in the rbc of camel for which it can long days without drinking?

Answer 1

Hii...
The RBC of camel is nucleated whereas usually in mammalian RBC nucleus is absent..
The oval shaped rbc can prevent dehydration in camel..by dividing and circulating...
So camels can drink more litres of water at a time as these nucleated RBC provide 240% more volume for water..

hope this helps!