1. Organization: Living organisms are highly organized, with cells as the basic unit of life. They exhibit hierarchical levels of organization from cells to tissues, organs, organ systems, and the organism itself. Non-living things lack this intricate organization.
2. Metabolism: Living organisms carry out chemical reactions to obtain and use energy, build and break down molecules, and eliminate waste. This constant flow of energy and matter is essential for life. Non-living things do not undergo metabolism.
3. Growth and Development: Living organisms increase in size and complexity over time. They undergo a series of changes, often guided by genetic instructions, that lead to their final form. Non-living things do not grow or develop in this way.
4. Reproduction: Living organisms produce offspring that inherit their characteristics. This ensures the continuity of life. Non-living things do not reproduce.
5. Response to Stimuli: Living organisms react to changes in their environment. They can sense and respond to stimuli, such as light, temperature, and touch. Non-living things do not have the capacity to respond to stimuli.
6. Adaptation: Living organisms can evolve over time, developing traits that increase their chances of survival in a changing environment. This adaptation is driven by natural selection. Non-living things do not evolve.
7. Homeostasis: Living organisms maintain a stable internal environment, despite fluctuations in the external environment. This ability to regulate internal conditions is crucial for survival. Non-living things do not exhibit homeostasis.
In summary, while there are exceptions and gray areas, living organisms are fundamentally different from non-living things because they display these life processes. Non-living things may exhibit some of these characteristics (e.g., a rock can be broken down), but they lack the complex interplay of all these processes that defines life.
