S1: Our ancestors thought that anything which moved itself was alive. P: The philosopher Descartes thought that both men and animals were machines. Q: But a machine such as a motorcar or a steamship moves itself, as soon as machines which moved themselves had been made, people asked “Is man a machine?” R: And before the days of machinery that was a good definition. S: He also thought that the human machine was partly controlled by the soul action on a certain part of the brain, while animals had no souls. S6: Therefore some scientists think that life is just a very complicated mechanism. The Proper sequence should be:

1. A Option A: PRSQ
2. B Option B: RPQS
3. C Option C: PSQR
4. D Option D: RQPS

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