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Euglena, the microscopic, one-celled organism, belongs to the Protista kingdom and the phylum Euglenophyta. Most live in quiet fresh water streams and ponds. Also, some Euglena are likely to develop within a polluted, fertilized body of water. The Euglena is rather common in warm seasons, where there is an abundance of rich organic waste. The Euglena is generally rotund. It is asymmetrical and can be flattened. Of the 150 species of Euglena, most tend to be green because of the chlorophyll, which creates the production of food through photosynthesis. However, some species can be bright red, due to a pigment called the astaxanthin. Because Euglena carried out photosynthesis but was mobile, many early scientists were quite baffled: It had carried the characteristics of both a plant and an animal (considering the fact that most plant are not mobile and most animals are not able to carry out photosynthesis). Since they wanted to sub-divide every living thing into either plants or animals, Euglena was a rat