In the following questions, the 1st and the last parts of the sentence are numbered 1 and 6. The rest of the sentence is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct. Then find the correct answer.
1. These positive effects vary from genetic changes that
P. to other related infections,
Q. make us more resistant to the diseases responsible
R. for epidemics and
S. which have effects on human that are
6. hard to pin down and quantify.
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