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Organism

An individual living thing, from a single bacterium to a tree or a person.Source: OpenStax, 2018

Level of life

How Organism connects

Organism is made of

  • Level of life

    Organ

    Several tissues combined into a structure with a particular job, such as the heart, a kidney or a leaf.

  • Structure

    Organ systems

    Groups of organs that work together, such as the circulatory, respiratory, digestive and urinary systems.

Organism makes up

  • Level of life

    Population

    All the members of one species living in the same area at the same time.

Organism includes the example

  • Organism or group

    Bacteria

    Small single-celled organisms without a nucleus, found almost everywhere on Earth. Most bacteria in the human body are harmless, and some are helpful.

    Open in Microbe Lab

  • Organism or group

    Archaea

    Single-celled organisms without a nucleus that form a separate domain of life from bacteria.

    Open in Microbe Lab

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Sources & further reading

The explanations on this page are our own summaries of these sources. Follow a link to read the original; if anything here disagrees with it, the original wins. How we choose and check sources.