Question

A camel can easily walk on sand but a man finds it difficult. why

Answer 1

because camel have special pad in there legs but human don't have that special pad in their legs

Answer 2

$my \: dear \: friend \: \\ here \: your \: answer$
Camels are desert animals and they have different adaptive features suiting their conditions.
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Camels have large broad feet and toes which help them to move in the sand . You might have learnt in physics larger the surface area lesser the pressure so the same principle is applied here in this case too , that is the reason why camels feet does not sink in the sand but our human feet sinks inside due to less the area of our feet and more the pressure and resultantly  man finds it difficult for him to walk over the sands .

$hope \: it \: will \: help \: you \:$