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HomeHomework HelpbiologyLevels of Organization

Levels of Organization

Levels of organization refer to the hierarchical structure of biological systems, ranging from the smallest unit, molecules, to the largest, the biosphere. This framework includes several tiers: atoms, molecules, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and ultimately the biosphere.

beginner
2 hours
Biology
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Overview

The levels of organization in biology illustrate how life is structured from the smallest molecules to the vast biosphere. Each level builds upon the previous one, creating a complex web of interactions that sustain life. Understanding these levels helps us appreciate the interconnectedness of all l...

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Key Terms

Atom
The smallest unit of matter that retains the properties of an element.

Example: An oxygen atom is essential for respiration.

Molecule
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Example: Water (H2O) is a molecule made of hydrogen and oxygen.

Cell
The basic structural, functional, and biological unit of all living organisms.

Example: Human skin cells protect the body.

Tissue
A group of similar cells that perform a specific function.

Example: Muscle tissue helps in movement.

Organ
A structure made up of different types of tissues that work together to perform a specific function.

Example: The heart pumps blood throughout the body.

Organism
An individual living entity that can react to stimuli, reproduce, and maintain homeostasis.

Example: A dog is an organism.

Related Topics

Cell Biology
Study of cell structure and function, essential for understanding life.
intermediate
Ecology
The study of interactions between organisms and their environment.
intermediate
Evolution
Understanding how life changes over time and the relationships between species.
advanced

Key Concepts

MoleculeCellOrganismEcosystem