- Living organisms are composed of cells, while nonliving matter lacks structural organization. Cells are the smallest units of life, and they contain the necessary components for sustaining life, such as cell membranes, DNA, and biochemical machinery.

2. Metabolism:

- Living organisms take in energy and use it to grow, reproduce, and maintain their internal environment. This process of nutrient acquisition, transformation, and waste elimination is known as metabolism. Nonliving matter lacks the ability to metabolize food or convert energy.

3. Growth and Reproduction:

- Living organisms undergo growth and reproduction. Growth refers to the increase in size or complexity, while reproduction refers to the process by which new individuals are produced. Nonliving entities do not possess the capacity to grow or reproduce.

4. Response to Stimuli:

- Living organisms respond to external stimuli or changes in their environment. These responses can include physiological or behavioral adaptations to ensure survival and reproduction. Nonliving matter does not exhibit any response to external stimuli.

5. Regulation:

- Living organisms maintain internal balance through regulatory mechanisms. For example, they regulate temperature, hormone levels, pH, and nutrient concentrations. Nonliving entities lack the ability to self-regulate internal conditions.

6. Adaptation:

- Living organisms show the capacity to adapt and evolve over time in response to environmental changes. This involves changes in genetic makeup, behavior, or physiology that increase an organism's chances of survival. Nonliving matter does not experience adaptation or evolution.

7. Organization:

- Living organisms exhibit various levels of organization, from the molecular level to whole organisms. They possess complex hierarchies of structures, systems, and organs that cooperatively contribute to their overall functioning. Nonliving matter lacks such hierarchical organization.

8. Homeostasis:

- Living organisms maintain a stable internal environment (homeostasis) despite external changes. This includes balancing temperature, water content, pH, and other parameters to sustain biochemical processes and maintain life. Nonliving matter does not maintain homeostasis.

By considering these fundamental characteristics of life, biologists can distinguish between living and nonliving entities. It's worth noting that some nonliving systems may exhibit certain features associated with life, but they generally lack the combination of attributes that define living organisms.