English Language · Sentence Rearrangement

Positions of S1 and S6 are fixed. Choose the most logical sequence for the remaining sentences (P, Q, R, S) to form a meaningful passage: S1. Of the various kinds of insect defences that of North American fungus-eating beetle is quite unusual. P: Both ants as well as mammals such as deer mice feed on this beetle. Q: This little beetle is able to recognize the kind of predator coming towards it and accordingly adopts a suitable defence. R: When facing a deer mouse, the beetle secretes an irritant from certain glands in its abdomen. S: While the beetle simply rolls itself into a compact ball in the face of an ant attack, it copes with the deer mouse differently. S6. The beetle's chemical secretion keeps the deer mouse at bay.