A Euglena is green in color because it has chloroplasts which contains chlorophyll contributing to the green color of the organism. Euglena are organisms that are single-celled which are found in fresh water. The specialized body structure located at the base of the tail is called the flagella which are used by these organisms to move in water.
Euglena is green because it contains chloroplasts. The structure located at the base of the tail (the flagellum) is called the photoreceptor. The photoreceptor detects light, while the chloroplasts produces sugars through photosynthesis.
