Decades: 310s BC 300s BC 290s BC 280s BC 270s BC - 260s BC - 250s BC 240s BC 230s BC 220s BC 210s BC
Years: 269 BC 268 BC 267 BC 266 BC 265 BC - 264 BC - 263 BC 262 BC 261 BC 260 BC 259 BC
... microscope that most school children ever encounter in a school biology lab. Onions are used because they have large cells that are easily visible under a student ...
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