Question

list the characteristics of life.

Answer 1

Common characteristics used to define life (briefly explained):

1. Cellular organization — made of one or more cells (the basic unit of life).
2. Metabolism/energy use — obtain and transform energy and matter to fuel activities and chemical reactions.
3. Homeostasis — regulate internal conditions (temperature, pH, ion balance) to remain stable.
4. Growth and development — increase in size and undergo regulated changes over an organism’s life.
5. Reproduction — produce new organisms (sexually or asexually) to pass on traits.
6. Heredity/genetic information — store and transmit information in molecules (DNA or RNA) that guide structure and function.
7. Response to stimuli — detect and respond to changes in the environment.
8. Adaptation and evolution — populations change over generations by natural selection, leading to traits suited to environments.

Note: Some entities (e.g., viruses) meet some but not all of these criteria, which fuels debate about whether they are “alive.”