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==Key Stage 3==
===Meaning===
[[File:Bacteria.png|right|300px|thumb|A magnified image of several bacteria.]]
Bacteria are [[unicellular]] [[microorganism]]s that have no [[nucleus]], [[mitochondria]] or [[chloroplast]] but do have [[cytoplasm]], a [[cell membrane]] and a [[cell wall]].
: [[Bacteria]] can cause disease but some are important to keep us healthy.
: Some [[bacteria]] have a tail called a [[flagellum]].
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