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Levels of Organization

This article explores the hierarchical structure of life, detailing the levels of organization from the smallest atoms to complex ecosystems. We begin with atoms, the basic building blocks of matter, and progress through molecules, macromolecules, organelles, cells, tissues, organs, and living organisms. Each level represents increased complexity and interaction, leading to communities and ecosystems. Finally, we examine the biosphere as the global network of life. This framework provides a foundational understanding of biology and the interconnectedness of life on Earth.

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Levels of Organization

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  1. Levels of Organization

  2. ATOMS • Smallest part of matter • NON-living

  3. Molecules • 2 or more bonded atoms • Form compounds • NON-living

  4. Macromolecule • Very large molecules • Proteins, fats, carbohydrates, nucleic acids • NON-living

  5. Organelles • “Tiny organs” • Made of macromolecules

  6. Cell • Made of organelles • Basic unit of structure & function • LIVING

  7. Tissue • The same kind cell working together • Living

  8. Organs • Tissues that work together • Living

  9. Systems • Organs that work together • Living

  10. Organism • Entire living things (organisms) • Usually made of systems • May be a single cell • Living

  11. Population • Same type of organism living together

  12. Community • Several populations living together • Population interact

  13. Ecosystem • A biotic (living) community plus the abiotic (nonliving) features

  14. Biome • Similar ecosystems on earth together

  15. Biosphere • Whole living layer around the globe • Includes abiotic features http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

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