The Torah tells us that Moshe and Aharon were born like any other mortals, to normal human parents.  They became prophets and leaders of the Jewish People due to their own actions and choices; not because they descended from on high like celestial angels.

From this we learn that every individual, through his own effort and free will, can reach even the highest spiritual levels – even as lofty as Moshe and Aharon.  ~ R’ Alexander Zusia Friedman – Ma’ayana Shel Torah