Euglena gracilis is a single-celled, freshwater species of microorganism that is commonly studied for its unique characteristics and potential applications in biotechnology and bioengineering. Euglena gracilis is a photosynthetic organism that can produce its own food through photosynthesis, but can also feed on organic matter, making it a versatile organism for research purposes. Research on Euglena gracilis often focuses on its ability to produce biofuels, such as hydrogen and lipids, as well as its potential use in wastewater treatment and nutrient recycling. Additionally, Euglena gracilis has been studied for its ability to produce high-value compounds, such as antioxidants and omega-3 fatty acids, which have potential applications in the pharmaceutical and nutraceutical industries. Overall, research on Euglena gracilis explores its unique biology and physiology, as well as its potential applications in various fields, making it an important organism for biotechnology research.