Nutrients from dead organisms back to the soil where it becomes available for plants

- Decomposition

Explanation:-

Decomposition is a natural process that occurs in the environment to break down organic substances into simpler substances.

All the living organisms that die, are decomposed and their bodies are broken down into simpler substances such that the nutrients are released into the soil.The plants are then able to absorb these nutrients from the soil and thus, the nutrient cycling goes on as the organisms feeds on it.Not only the dead animals but also the fallen leaves and other parts of the plant gets decomposed as they die. The process of decomposition is carried out by living organisms present in the soil such as bacteria. Such organisms are called as decomposers.

The correct answer is b