1. Organization: Living organisms are highly organized, consisting of intricate structures and systems. They have a cellular-based organization, with cells being the fundamental units of life.
2. Metabolism: Living organisms maintain a constant internal environment by acquiring and transforming energy through metabolic processes. This involves the breakdown of nutrients and the release of energy for growth, reproduction, and other life processes.
3. Response to Stimuli: Living organisms are capable of sensing and responding to external stimuli in their environment. They can detect and react to changes in light, temperature, touch, chemical substances, or other forms of stimuli.
4. Growth and Development: Living organisms undergo growth, which is an increase in size and complexity. They also exhibit development, which refers to changes in structure and function over time. Development involves processes like differentiation, where cells specialize to perform specific functions.
5. Reproduction: Living organisms have the ability to reproduce and create new individuals. This ensures the continuation of their species. Reproduction can be asexual or sexual, with asexual involving the duplication of existing cells, and sexual involving the fusion of genetic material.
6. Adaptation and Evolution: Living organisms adapt to their environment through the process of evolution. Evolution is the change in the inherited traits of a population over time. Adaptations are traits that enhance an organism's survival and reproductive success in its particular environment.
7. Homeostasis: Living organisms maintain a state of internal balance called homeostasis. They have mechanisms to regulate their internal environment within certain limits, despite external changes. This includes regulating temperature, pH, ion concentrations, and other vital parameters.
8. Energy Processing: Living organisms continually acquire and use energy for various life processes. They convert various forms of energy, such as sunlight through photosynthesis or chemical energy through respiration, into forms usable by cells.
9. Genetic Information and Heredity: Living organisms carry genetic information in their DNA ( deoxyribonucleic acid). DNA is responsible for storing and transmitting hereditary information to offspring. The genetic code determines the traits and characteristics that are passed on from one generation to the next.
10. Complexity: Living organisms are characterized by complexity at multiple levels, ranging from the molecular and cellular level to the organismal and ecological level. They exhibit intricate biochemical pathways, cellular structures, and ecological interactions.
These characteristics taken together define life and distinguish living organisms from non-living matter. While certain characteristics may be present in non-living systems to some extent, the presence of all these characteristics collectively is what separates living organisms from non-living entities.
