Question

what is Euglina and it's function ​

Answer 1

Euglena is a genus of single cell flagellate eukaryotics. The species Euglena gracilis has been used extensively in the laboratory as a model organism. 

Its function when acting as a heterotroph, the Euglenasurrounds the particle of food and consumes it by phagocytosis, or in other words, engulfing the food through its cell membrane.