* Organization: Living things are made up of one or more cells, which are the basic units of life. These cells are organized into tissues, organs, and organ systems.
* Metabolism: Living things carry out chemical reactions that allow them to obtain and use energy. They break down nutrients and release waste products.
* Growth and Development: Living things increase in size and complexity over time.
* Adaptation: Living things can change over time in response to their environment. This process is called evolution.
* Homeostasis: Living things maintain a stable internal environment, despite changes in the external environment.
* Responsiveness: Living things can sense and respond to stimuli from their environment.
* Reproduction: Living things can produce new organisms that are similar to themselves.
While these characteristics are generally considered defining features of life, it's important to note that some non-living entities may exhibit some of these characteristics to a limited extent. For instance, viruses can replicate, but they lack many other characteristics of life, such as metabolism and organization.
Ultimately, the question of what constitutes life is a complex one with no easy answer.
