Scientists review and ask questions about the results of other scientists' work. The details are different for different organisms. Some are harmful to the organism, while others are beneficial. Humans change environments in ways that can be either beneficial or detrimental for themselves and other organisms. Changes in environments can be natural or influenced by humans.
Some environmental changes occur slowly, and others occur rapidly.
Decomposers are a vital link in the natural cycle of life and death. Through decomposition, minerals and nutrients, once useful to their plant or animal hosts, are released and recycled. Decomposition is the natural breaking down of organic materials. It is the main way that nutrients are recycled into the soil. In the process of decomposition, complex molecules are reduced to simple molecules.