An organism is a living individual that consists of one or more cells, capable of carrying out all the functions of life independently. These functions include:

* Nutrition: Obtaining and processing energy and materials

* Growth: Increasing in size and complexity

* Reproduction: Creating new individuals

* Response: Reacting to stimuli in the environment

* Homeostasis: Maintaining a stable internal environment

* Adaptation: Evolving over time to better suit its environment

Here are some key characteristics of organisms:

* Organized Structure: All organisms have a complex and organized structure, with specific parts performing specialized functions.

* Metabolism: Organisms carry out chemical reactions to maintain life, converting energy and matter.

* Genetic Information: Organisms possess DNA, which carries the instructions for their development and function.

* Evolution: Organisms change and adapt over generations through natural selection.

Examples of organisms:

* Humans

* Animals

* Plants

* Bacteria

* Fungi

* Protists

Non-examples of organisms:

* Viruses (non-living, require a host cell to replicate)

* Rocks

* Water

Understanding the definition of an organism helps us to appreciate the diversity of life on Earth and the complex processes that sustain it.