The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Biological organization in living organisms occurs at multiple levels, each building upon the previous level to form a complex and functional system. These levels of organization include submicroscopic, atomic, cellular, and mixture levels. Let's discuss each level in detail:

1. Submicroscopic level (a):
- At the submicroscopic level, biological organization involves the study of particles smaller than cells, such as molecules and macromolecules.
- This level focuses on understanding the chemical interactions and processes that occur within living systems.
- Examples of submicroscopic components include DNA, proteins, enzymes, and other biomolecules.
- Studying this level helps in understanding the molecular basis of life and how various molecules interact to carry out biological functions.

2. Atomic level (b):
- The atomic level of biological organization delves into the study of individual atoms that make up molecules.
- Atoms are the building blocks of all matter, including biological molecules.
- Understanding the arrangement and properties of atoms helps in comprehending how molecules function in living organisms.
- For instance, knowing the atomic structure of DNA enables us to understand its role in genetic information storage and replication.

3. Cellular level (c):
- The cellular level of organization is concerned with the study of cells, which are the basic units of life.
- Cells are highly organized structures that perform specific functions within an organism.
- They possess various organelles that carry out specific tasks, such as energy production, protein synthesis, and cell division.
- Different types of cells form tissues, organs, and organ systems, which work together to maintain the overall function of an organism.

4. Mixture level (d):
- The mixture level of biological organization refers to the interactions between different components within a living system.
- It involves the integration of cells, tissues, organs, and organ systems to form a functioning organism.
- At this level, different biological components interact and work together to maintain homeostasis, respond to stimuli, and carry out essential life processes.
- This level emphasizes the dynamic nature of living systems and the interdependence of various components.

In conclusion, biological organization in a living state occurs at multiple levels, starting from the submicroscopic and atomic levels, progressing to the cellular level, and culminating in the mixture level, where different components interact to form a functional organism. Understanding these levels of organization is crucial for comprehending the complexity and functionality of living systems.

Cellular level