The SS officers view the inmates as subhuman and their only value is in physical ability/health.
In the passage, it is understood that life or death depends on the level to which doctors of the SS consider the captives as physically appropiate to stay as useful workers. Here, the head of the block recommends the prisoners to follow some steps so SS doctors are convinced that they can be selected.
The salutation is to greet the person you are addressing, it goes before the introduction. The introduction is a brief summary of the letter itself and the body is the letter itself.
They are both worried about standing out and being embarrassed.
Explanation:
Annie expresses that she is worried about being judged and so does Ethan. They both state that they don't want to stand out because they are afraid of being judged and made-fun of.
