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1.
S₁: Of the various kinds of insect defences that of the North American fungus - eating beetle is quite unusual.
S₆: The beetle's chemical secretion keeps the deer mouse at bay.

P: Both ants as well as mammals such as deermice 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 deermouse, 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.