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| style="height:20px; width:200px; text-align:center;" |Several colonies of [[bacteria]] being grown in a '''petri dish'''.
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===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Petri dishes, page 17, GCSE Biology; The Revision Guide, CGP, AQA '']