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Unicellular Organisms

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Unicellular Organisms
Reading Level

	edHelper's suggested reading level:	grades 5 to 8
	Flesch-Kincaid grade level:	7.07

Vocabulary

challenging words:

amoeba, amoebic, euglena, extremophiles, flagellum, paramecium, shape-shifters, silly-ah, stentor, stentors, unicellular, engulf, deep-sea, fatal, dysentery, naked

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Unicellular Organisms By Cindy Grigg

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¹     You know that living things are made of cells. Some living things are made of only one cell. They are called unicellular. Uni- means one, as a unicycle has only one wheel. Most of us don't think about these unicellular creatures very much, but they are all around us. Most are invisible without a microscope, but a few can be seen with the naked eye.
 
²     The main groups of unicellular organisms are bacteria, protozoa, unicellular algae, and unicellular fungi or yeasts. Each species is unique. They can be interesting to study because of their intricate and beautiful patterns. Some are sensitive to light. They may move toward it or away from it. They have novel ways of moving around. They also respond to touch. Some can live in very extreme environments.
 
³     Single-celled organisms have been on Earth for 3.8 billion years. They have had a long time in which to adapt. Scientists believe they were the first forms of life on Earth. Although they are only one cell, they are complex. The more that we learn about them, the more marvelous we find them to be.

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