Direction: The following passage consists of six sentences. The first and the sixth sentences are given. The middle four sentences in each have been removed and jumbled up. These are labeled P, Q, R, and S. You are required to find out the proper sequence of the four sentences and choose the correct order from the options.

S1: Environmental pollution is one of the most serious global challenges.

S6: The study of this chapter is essential to learn more about Environmental pollution.

P: Wild-type organisms have a slower degradation rate of hazardous materials.

Q: Currently, advanced molecular biology tools along with conventional approaches allow us to rapidly degrade or accumulate hazardous materials from environments.

R: In this chapter, conventional and advanced molecular biology tools for the removal and detoxification of contaminants from soil and water to improve environmental conditions are highlighted.

S: This can help modify microorganisms to gain the ability to sense and degrade hazardous chemicals from contaminated sites, in turn, allowing us to grow vegetation and improve crop productivity.