Different life forms adapt to their environment. Stable ecosystem creates a stable environment for life forms. In stable environment, life forms do not have to adapt all the time and their energy can be invested into other life processes, such as growth, reproduction, etc. Stability of ecosystem is important for adjoining ecosystems because that way boundaries and influences could be extended. Stable ecosystems are able to interact and both benefit from each other.
Water freezes as 0º Celsius and 32º Fahrenheit.
I'm not sure what more there is to compare.
They can protest to use safer sources of energy like power plants.
