The following sentences form a paragraph. The sentences are numbered as P, Q, R, S and T. These sentences are not given in their proper order. Read the sentences and choose the alternative that arranges them in correct order.

P. Snakes use their venom cautiously, injecting amounts sufficient to disable prey or to defend against predators.

Q. Venom is composed of a combination of proteins, enzymes, and other molecular substances.

R. These toxics substances work to destroy cells, disrupt nerve impulses, or both.

S. Snake venom is the poisonous, typically yellow fluid stored in the modified salivary glands of venomous snakes.

T. While snake venom is poisonous and deadly, researchers also use its components to develop drugs to treat human diseases.