you already know
there are two flagellums on a Euglena a short one and a long one. They are both held by a pouch. The long flagella helps the euglena move.
it can live forever, unless something eats it, or it dries out other than that algae usually (can) live foreverPS seaweed is in ice cream ewww!
They don't age, but they live for about 3 weeks.
3 weeks typiclly they don`t have such along lifespan