Unicellular organism | Wikipedia audio article
Channel: wikipedia tts
Date: 10/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Unicellular_organism


00:01:40 1 Evolutionary hypothesis
00:03:28 2 Prokaryotes
00:04:23 2.1 Bacteria
00:06:38 2.2 Archaea
00:09:47 3 Eukaryotes
00:12:06 3.1 Protozoa
00:14:53 3.2 Unicellular algae
00:16:36 3.3 Unicellular fungi
00:17:55 4 Macroscopic unicellular organisms
00:19:14 5 See also



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SUMMARY
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A unicellular organism, also known  as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell. Unicellular organisms fall into two general categories: prokaryotic organisms and eukaryotic organisms. Prokaryotes include bacteria and archaea. Many eukaryotes are multicellular, but the group includes the protozoa, unicellular algae, and unicellular fungi. Unicellular organisms are thought to be the oldest form of life, with early protocells possibly emerging 3.8–4 billion years ago.Although some prokaryotes live in colonies, they are not specialised into cells with differing functions. These organisms live together, and each cell must carry out all life processes to survive. In contrast, even the simplest multicellular organisms have cells that depend on each other to survive.
Most multicellular organisms have a unicellular life-cycle stage. Gametes, for example, are reproductive unicells for multicellular organisms. Additionally, multicellularity appears to have evolved independently many times in the history of life.
Some organisms are partially unicellular, like Dictyostelium discoideum. Additionally, unicellular organisms can be multinucleate, like Myxogastria and Plasmodium.