S1 : Plants need carbon for building the tissue of their bodies.
S6 : Thus through a complex process called photosynthesis, plants receive their requirements from the soil and Sun.
P : The breaking up of carbon dioxide into its components requires energy, which they derive from the Sun.
Q : Plants’ other needs of nutrients are derived from the soil and water through their roots.
R : They derive this carbon from the carbon dioxide in the air.
S : They break up the carbon dioxide, absorb the carbon and discharge oxygen into the air for animals to breathe.

The proper sequence should be:

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