The answer is B. Because the Earth’s atmosphere is mostly nitrogen and oxygen.
It depends,
-during timed tests, such as the SAT or ACT, one does need to remember the passages and information given to answer the questions with deliberate speed to finish on time
-regarding schoolwork, it’s better to read it over twice or thrice just to understand the question and to develop an answer that would best fit it.
If it doesn’t contain any of the following definition then it’s wrong
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
