Any living being consisting of a single cell.
Most are invisible without a microscope but a few, such as the giant amoeba, may be visible to the naked eye.
The main groups of unicellular organisms are bacteria, archaea, protozoa, unicellular algae, and unicellular fungi or yeasts.
Some become disease-causing agents (pathogens).
All living things have a circle of life. Birth, growth, reproduction, and death are natural parts of the natural world.
A prokaryote is an organism that is almost always single-celled.
The prokaryote’s DNA travels openly around the cell.
All bacteria are prokaryotes.
An eukaryote is an organism that can either be single-celled or multi-celled, can reproduce in one of several ways (e.g. meisos, mitosis) and has a cell nucleus within which its DNA is contained.
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