Which of these words is analogous (similar in meaning) to pollution? a. degradation. b. decomposition c. replenishment d. improvement.

The answer is A. Pollution is harmful substances that can damage organisms and the environment. Decomposition returns nutrients into the soil which helps organisms grow and reproduce. Replenishment is to fill something which would be a good thing. Improvement means to make something better which is also a good thing. Degradation means to degrade or make something worse which is what pollution is doing to organisms and the environment.