Organism

Life on Earth Temporal range: Late Hadean - Recent
These Escherichia coli cells provide an example of a prokaryotic microorganism
Scientific classification
(unranked):	Life on Earth (Gaeabionta)
Domains and Kingdoms
Nanobes ? Acytota **? Cytota Bacteria * Neomura Archaea Eukaryota Bikonta Apusozoa Cabozoa Rhizaria Excavata Corticata Archaeplastida Rhodophyta Glaucophyta Plantae Chromalveolata Heterokontophyta Haptophyta Cryptophyta Alveolata Unikonta Amoebozoa Opisthokonta Choanozoa Fungi Animalia

An organism is a living thing. Animals and plants are organisms. Organisms are a biotic, or living, part of the environment. Rocks and sunshine are a part of the abiotic, or non-living, environment.

Organisms have five basic needs. They need air, water, nutrients (food), energy and a place to live. Animals and plants are organisms.

Some organisms are made up of millions of cells. They are called multicellular organisms. Some examples are dogs, trees, and humans. Most multicellular organisms can be seen without using a microscope.

Some organisms are so small that they cannot be seen with the naked eye. You need a microscope to see them. They are called microorganisms. Organisms can be made up of just one cell. They are called unicellular organisms or single celled organisms. Examples include bacteria, amoeba and protozoa such as the paramecium.

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