1. Organization: Living organisms are highly organized, with specialized structures at different levels of complexity. This includes cells as the basic unit of life, tissues, organs, organ systems, and finally the organism itself.
2. Metabolism: Living organisms carry out a wide range of chemical reactions collectively known as metabolism. These reactions allow them to acquire and use energy for growth, maintenance, and reproduction. Key aspects include:
* Anabolism: Building complex molecules from simpler ones
* Catabolism: Breaking down complex molecules into simpler ones
3. Growth and Development: Living organisms grow and develop over time, increasing in size and complexity. Growth refers to an increase in mass, while development involves changes in structure and function.
4. Response to Stimuli: Living organisms can sense and respond to changes in their environment, called stimuli. This allows them to adapt to changing conditions and maintain homeostasis.
5. Homeostasis: Living organisms maintain a stable internal environment despite external fluctuations. This involves regulating factors like temperature, pH, and nutrient levels.
6. Reproduction: Living organisms produce offspring, ensuring the continuation of their species. Reproduction can be asexual (from a single parent) or sexual (from two parents).
7. Adaptation: Living organisms evolve over time through natural selection, adapting to their environment and increasing their chances of survival and reproduction.
8. Heredity: Living organisms pass on their genetic information to their offspring through DNA, which governs their traits and characteristics.
9. Cellular Structure: All living organisms are made up of one or more cells, the basic unit of life. These cells contain the necessary components for life, including DNA, RNA, and various organelles.
It's important to note that these characteristics are not mutually exclusive. They often overlap and interact with each other to define the complexity of living organisms.
