controlled examine= comp ar control assemblage to an experimental root *control group does not acquire the factor that you ar e testing *experimental group does have the factor cosmos tested Types of Microscopes: 1. light= the ones most used in classrooms 2. negatron= uses a beam of electrons instead of light; around 200,000 measure stronger than light microscopes If you want to get a ripe essay, order it on our website: OrderCustomPaper.com
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