Concept:The sentences must be arranged in a logical sequence that connects the initial statement (S1) about interdependence to the final statement (S6) about human overconsumption.
Explanation:The passage begins with S1, stating that all living things affect their surroundings.
Sentence Q introduces a specific example: earthworms make burrows and worm casts.
This is the first logical step, so Q comes after S1.
Sentence R explains the consequence of the earthworms' action: it affects the soil and plants.
Thus, R follows Q naturally.
Sentence S shifts to another example: rabbits' fleas carry the myxomatosis virus, affecting rabbit population size.
This builds on the idea of interdependence, so S comes after R.
Sentence P mentions the further effect: this virus can also affect foxes if they depend on rabbits for food.
P logically concludes the sequence before S6, which warns about human misuse of nature.
Thus, the correct order is Q, R, S, P.
Answer:Option C: Q, R, S, P