In Night by Elie Wiesel, what are three obstacles to survival that stand in Eliezer's way?

In Eliezer's struggle for survival, after he and his
father are sent to the first camp at Birkenau and he is separated from his mother and
sisters, Eliezer learns that his first obstacle to survival is avoiding death: death by
beatings from the Kapo and death by selection for the death chambers. The second
obstacle to survival is being able to survive the marches and transport to other camps
when they march from Birkenau to Auschwitz and from Auschwitz to Buna and from Buna to
Gleiwitz and are transported from Gleiwitz to Buchenwald. Of the hundred who began the
transport in Eliezer's train car, he and his father were two of the dozen who survived
the trip. The third obstacle to survival is Eliezer's commitment to never turn on or
abandon his father: their struggle for survival would be a shared struggle. Eliezer saw
Rabbi Eliahou's son abandon him between Buna and Gleiwitz. He then saw a son kill his
father over a scrap of bread thrown into the car on the transport from Gleiwitz to
Buchenwald. Eliezer withstood each of these struggles, as witnessed by the book
Night, and was seated at his father's side when he spoke then
breathed his last. Eliezer's name was his father's last word.