Answer: A) He has already been to the asteroid.
Explanation: In the given lines we can see Kenniston talking to another person, they are discussing whether or not they have to go back to an asteroid and that in order to do that, they need to find a ship. An inference is something that the text doesn't say in a literal way, but that we can understand when we read the text, in this case we can infer that Kenniston has already been to the asteroid because he said "we've got to get back".
Because it has something covering it and he has to watch his back
it says choose all that apply. meaning there is more than one answer. you only chose one. the answer you chose is correct but "the substance" and "the amount" go along with "difference in temperature".
