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This kind of question is extremely common in A level biology, they want you to explain a system and apply your knowledge of biological principals to it.

To understand alveoli we need to understand ...

The first important thing to remember is that there is no equivalent in Enlgish, as both verbs mean 'to be'. They can also not be used interchangeably, and both have a slightly different meaning. I think ...

12th term = a + (12 - 1)*d = 2 + 11(3) = 35

Sum (9) = 9/2 [2(2) + (9 - 1)*3] = 9/2 [28] = 252/2 = 126

E=1.5MeV = (1.5x10^6)(1.6x10^-19)J = 2.4x10^-13J E=hf, f=E/h = (2.4x10^-13)/(6.63x10^-34)=3.6x10^20Hz

In order to do well in the exam, the first thing is to figure out the AOs, or the Assessment Objectives required in each question of your paper.  Many students make the mistake of not remembering the AOs ...