In general, land-based ecosystems vary considerably in the amount and diversity of life they support. The earth's land base and water supply is fixed in its kind and amount. Within an ecosystem, all living things are interdependent and interrelated. All living things are affected by and interact with their environment. Either directly or indirectly, humans and animals depend upon plants.
Food chains range from very simple to very complex.
An ecosystem contains many habitats. E. A local ecosystem changes with time. These changes impact life within the system. Change is a natural occurrence within every ecosystem. Large-scale natural events may cause ecosystems to change very rapidly.