Concept:This question tests your ability to arrange sentences in a logical sequence to form a coherent paragraph.
Explanation:Start with sentence Q: "They are home to countless species." It directly follows the opening line about rainforests being essential for biodiversity.
Next is R: "Yet, deforestation threatens these ecosystems." It introduces a contrast after stating the importance.
Then S: "Some plants even hold potential medical cures." This adds a specific detail about the value of rainforest plants.
Finally, P: "Trees store carbon and release oxygen." This gives a broader environmental benefit, leading to the concluding sentence about global concern.
The correct order is Q, then R, then S, then P.
Answer:Option B (QRSP)