Lord of the rings: the whole series

i would like somebody to explain to me why the most insignificant being in the sire is chose to take this quest. (no opinions, author facts preferably)

Because the others couldn't resist the temptations of the ring.

Sgt. Floyd said:

Because the others couldn't resist the temptations of the ring.

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okay. how is that so? its not like frodo could resist the ring very well... why didnt they make an eagle thing fly frodo then? it doesnt make sense