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==Key Stage 3==
===Meaning===
[[File:Euglena.png|right|300px|thumb|A picture of a Euglena.]]
A [[Euglena]] is a [[unicellular]] [[microorganism]] that has a [[Cell Membrane|cell membrane]], [[cytoplasm]], [[chloroplast]]s, a [[Nucleus (Biology)|nucleus]] and a [[flagellum]].