1 : The decomposers P : and hence help to clean the environment Q : help in decomposing the R : dead bodies of plants and animals S : and put back various useful elements 6 : into soil, air and water. The Proper sequence should be:

The correct answer is: A. PSQR

The decomposers help in decomposing the dead bodies of plants and animals, and put back various useful elements into soil, air and water. This helps to clean the environment.

Option B: QPRS is incorrect because the decomposers help in decomposing the dead bodies of plants and animals, not the other way around.

Option C: QRPS is incorrect because the decomposers put back various useful elements into soil, air and water, not the other way around.

Option D: SQRP is incorrect because the decomposers help to clean the environment, not the other way around.